diff --git a/lua/custom/keymaps/buffers.lua b/lua/custom/keymaps/buffers.lua
index ea9d72f..e13bafc 100644
--- a/lua/custom/keymaps/buffers.lua
+++ b/lua/custom/keymaps/buffers.lua
@@ -1,4 +1,4 @@
--- Buffer group mappings
+-- buffer group mappings
 --
 
 local status_wk, wk = pcall(require, 'which-key')
diff --git a/lua/custom/keymaps/edit.lua b/lua/custom/keymaps/edit.lua
index 59e1ca5..e7d1a34 100644
--- a/lua/custom/keymaps/edit.lua
+++ b/lua/custom/keymaps/edit.lua
@@ -1,6 +1,6 @@
--- Edition mappings
---
+-- edition mappings
 --
+
 local status_kh, kh = pcall(require, 'custom.plugins.keymaps-helper')
 if not status_kh then
   return
@@ -8,18 +8,5 @@ end
 
 kh.map({ 'n', 'v', 'i' }, '<C-z>', '<CMD>undo<CR>', { silent = true, noremap = true, desc = 'Undo' })
 
--- local status_wk, wk = pcall(require, 'which-key')
--- if not status_wk then
---   return
--- end
---
--- wk.add {
---   {
---     mode = { 'n', 'v', 'i' },
---     -- mapping runs here as which-key intercepts ctrl-z signal before term
---     { '<C-z>', '<CMD>undo<CR>', desc = 'Undo', silent = true, noremap = true, hidden = true },
---   },
--- }
-
 -- The line beneath this is called `modeline`. See `:help modeline`
 -- vim: ts=2 sts=2 sw=2 et
diff --git a/lua/custom/keymaps/files.lua b/lua/custom/keymaps/explore.lua
similarity index 96%
rename from lua/custom/keymaps/files.lua
rename to lua/custom/keymaps/explore.lua
index d1b03de..194be98 100644
--- a/lua/custom/keymaps/files.lua
+++ b/lua/custom/keymaps/explore.lua
@@ -1,4 +1,4 @@
--- Neo-tree mappings
+-- file explorer mappings
 --
 
 local status_wk, wk = pcall(require, 'which-key')
diff --git a/lua/custom/keymaps/general.lua b/lua/custom/keymaps/general.lua
index 18d0211..f131c28 100644
--- a/lua/custom/keymaps/general.lua
+++ b/lua/custom/keymaps/general.lua
@@ -1,4 +1,4 @@
--- General mappings
+-- general mappings
 --
 
 local status_kh, kh = pcall(require, 'custom.plugins.keymaps-helper')
diff --git a/lua/custom/keymaps/groups.lua b/lua/custom/keymaps/groups.lua
index e86633c..b12a65d 100644
--- a/lua/custom/keymaps/groups.lua
+++ b/lua/custom/keymaps/groups.lua
@@ -1,4 +1,4 @@
--- Key mappings groups
+-- key mappings groups
 --
 
 local status_wk, wk = pcall(require, 'which-key')
@@ -12,6 +12,7 @@ wk.add {
       mode = { 'n' },
       { '<leader>s', group = '[s]earch' },
       { '<leader>t', group = '[t]oggles' },
+      { '<leader>T', group = '[T]erminal' },
     },
 
     {
diff --git a/lua/custom/keymaps/init.lua b/lua/custom/keymaps/init.lua
index 0cd8a27..6d69266 100644
--- a/lua/custom/keymaps/init.lua
+++ b/lua/custom/keymaps/init.lua
@@ -5,11 +5,12 @@ require 'custom.keymaps.nop'
 require 'custom.keymaps.groups'
 require 'custom.keymaps.general'
 require 'custom.keymaps.buffers'
-require 'custom.keymaps.files'
+require 'custom.keymaps.explore'
 require 'custom.keymaps.edit'
 require 'custom.keymaps.search'
 require 'custom.keymaps.toggles'
 require 'custom.keymaps.obsidian'
+require 'custom.keymaps.terminal'
 
 -- The line beneath this is called `modeline`. See `:help modeline`
 -- vim: ts=2 sts=2 sw=2 et
diff --git a/lua/custom/keymaps/nop.lua b/lua/custom/keymaps/nop.lua
index 11c292f..d56f357 100644
--- a/lua/custom/keymaps/nop.lua
+++ b/lua/custom/keymaps/nop.lua
@@ -1,4 +1,4 @@
--- Deactivated key mappings
+-- deactivated key mappings
 --
 
 local status_wk, wk = pcall(require, 'which-key')
diff --git a/lua/custom/keymaps/obsidian.lua b/lua/custom/keymaps/obsidian.lua
index 481aada..d3469d1 100644
--- a/lua/custom/keymaps/obsidian.lua
+++ b/lua/custom/keymaps/obsidian.lua
@@ -1,4 +1,4 @@
--- Obsidian mappings
+-- obsidian mappings
 --
 
 local status_wk, wk = pcall(require, 'which-key')
diff --git a/lua/custom/keymaps/search.lua b/lua/custom/keymaps/search.lua
index dd18013..7c30dbf 100644
--- a/lua/custom/keymaps/search.lua
+++ b/lua/custom/keymaps/search.lua
@@ -1,4 +1,4 @@
--- Search group mappings
+-- search group mappings
 --
 
 local wk = require 'which-key'
diff --git a/lua/custom/keymaps/terminal.lua b/lua/custom/keymaps/terminal.lua
new file mode 100644
index 0000000..d5001d4
--- /dev/null
+++ b/lua/custom/keymaps/terminal.lua
@@ -0,0 +1,26 @@
+-- terminal mappings
+--
+
+local status_wk, wk = pcall(require, 'which-key')
+if not status_wk then
+  return
+end
+
+local status_th, th = pcall(require, 'custom.plugins.term-helper')
+if not status_th then
+  return
+end
+
+wk.add {
+  {
+    mode = { 'n', 'v', 'i' },
+    { '<leader>Ti', th.new_terminal_ipython, desc = 'new [i]python terminal', silent = true, noremap = true },
+    { '<leader>Tj', th.new_terminal_julia, desc = 'new [j]ulia terminal', silent = true, noremap = true },
+    { '<leader>Ts', th.new_terminal_shell, desc = 'new terminal with [s]hell', silent = true, noremap = true },
+    { '<leader>Tp', th.new_terminal_python, desc = 'new [p]ython terminal', silent = true, noremap = true },
+    { '<leader>TR', th.new_terminal_r, desc = 'new [R] terminal', silent = true, noremap = true },
+  },
+}
+
+-- The line beneath this is called `modeline`. See `:help modeline`
+-- vim: ts=2 sts=2 sw=2 et
diff --git a/lua/custom/keymaps/toggles.lua b/lua/custom/keymaps/toggles.lua
index a57782d..c3e19b7 100644
--- a/lua/custom/keymaps/toggles.lua
+++ b/lua/custom/keymaps/toggles.lua
@@ -1,15 +1,35 @@
--- Toggles group mappings
+-- toggles group mappings
 --
 
 local wk = require 'which-key'
 local gitsigns = require 'gitsigns'
 
+local function toggle_light_dark_theme()
+  if vim.o.background == 'light' then
+    vim.o.background = 'dark'
+  else
+    vim.o.background = 'light'
+  end
+end
+
+local function toggle_conceal()
+  local lvl = vim.o.conceallevel
+  if lvl > DefaultConcealLevel then
+    vim.o.conceallevel = DefaultConcealLevel
+  else
+    vim.o.conceallevel = FullConcealLevel
+  end
+end
+
 wk.add {
   mode = { 'n' },
   -- gitsigns
   { '<leader>tb', gitsigns.toggle_current_line_blame, desc = 'toggle git show [b]lame line' },
-  { '<leader>tD', gitsigns.preview_hunk_inline, desc = 'toggle git show [D]eleted' },
+  { '<leader>td', gitsigns.preview_hunk_inline, desc = 'toggle git show [d]eleted' },
   { '<leader>tm', '<CMD>RenderMarkdown buf_toggle<CR>', desc = 'toggle [m]arkdown rendering for current' },
+  { '<leader>tt', toggle_light_dark_theme, desc = 'toggle light/dark [t]heme' },
+  { '<leader>tc', toggle_conceal, desc = 'toggle [c]onceal' },
+  { '<leader>tz', ':setlocal spell!<cr>', desc = 'toggle [z]pellcheck' },
 }
 
 -- The line beneath this is called `modeline`. See `:help modeline`
diff --git a/lua/custom/plugins/neotree-helper.lua b/lua/custom/plugins/neotree-helper.lua
index e8c4056..a3b2aca 100644
--- a/lua/custom/plugins/neotree-helper.lua
+++ b/lua/custom/plugins/neotree-helper.lua
@@ -1,5 +1,6 @@
 -- Neo-tree helper module
 --
+
 local M = {}
 
 -- Function to get confirmation input (compatible with different neo-tree versions)
@@ -30,12 +31,12 @@ function M.smart_open()
     vim.cmd('Neotree toggle reveal=false position=float dir=' .. vim.fn.expand '~')
     -- Si c'est un fichier réel, révéler le fichier dans l'arborescence
   elseif is_real_file and bufname ~= '' then
-    -- vim.cmd('Neotree toggle position=left reveal_force_cwd=true dir=' .. vim.fn.expand '%:p:h')
-    vim.cmd 'Neotree position=left reveal_force_cwd=true'
+    vim.cmd('Neotree toggle position=left reveal_force_cwd=true dir=' .. vim.fn.expand '%:p:h')
+    -- vim.cmd 'Neotree toggle position=left reveal_force_cwd=true'
     -- Sinon, ouvrir dans le répertoire de travail courant
   else
-    -- vim.cmd('Neotree toggle position=left reveal_force_cwd=true dir=' .. vim.fn.getcwd())
-    vim.cmd 'Neotree toggle position=left reveal_force_cwd=true'
+    vim.cmd('Neotree toggle position=left reveal=true dir=' .. vim.fn.getcwd())
+    -- vim.cmd 'Neotree toggle position=left reveal_force_cwd=true'
   end
 end
 
diff --git a/lua/custom/plugins/term-helper.lua b/lua/custom/plugins/term-helper.lua
index c09ace6..cf87b4d 100644
--- a/lua/custom/plugins/term-helper.lua
+++ b/lua/custom/plugins/term-helper.lua
@@ -2,140 +2,171 @@
 -- from: https://github.com/jmbuhr/nvim-config
 --
 
----@module 'utils.term'
-local M = {
-  ---Map of buffers to a terminals
-  ---@type table<integer, Terminal>
-  buf_term_map = {},
-}
+-- ---@module 'utils.term'
+-- local M = {
+--   ---Map of buffers to a terminals
+--   ---@type table<integer, Terminal>
+--   buf_term_map = {},
+-- }
+--
+-- ---A terminal has a buffer number, a type and a channel id
+-- ---@class Terminal
+-- ---@field bufnr integer
+-- ---@field type string?
+-- ---@field channel_id integer
+--
+-- ---Get the channel id of a terminal buffer
+-- ---@param bufnr integer
+-- ---@return integer|nil
+-- local function get_channel_id(bufnr)
+--   return vim.api.nvim_get_option_value('channel', { buf = bufnr })
+-- end
+--
+-- ---Get the type of the terminal buffer
+-- ---like ipython, R, bash, etc.
+-- ---based on the buffer name
+-- ---@param buf integer
+-- ---@return string|nil
+-- local function get_term_type(buf)
+--   local name = vim.api.nvim_buf_get_name(buf)
+--   local term_type = name:match 'term://.*/%d+:(.*)'
+--   if not term_type then
+--     return nil
+--   end
+--   -- drop flags like --no-confirm-exit
+--   term_type = term_type:match '([^%s]+)'
+--   -- drop the path to the executable
+--   term_type = term_type:match '([^/]+)$'
+--   return term_type
+-- end
+--
+-- ---Find nvim terminal buffers
+-- local function list_terminals()
+--   local terms = {}
+--   for _, buf in ipairs(vim.api.nvim_list_bufs()) do
+--     if vim.api.nvim_buf_is_valid(buf) and vim.api.nvim_get_option_value('buftype', { buf = buf }) == 'terminal' then
+--       local chan_id = get_channel_id(buf)
+--       if not chan_id then
+--         goto continue
+--       end
+--       ---@type Terminal
+--       local term = {
+--         bufnr = buf,
+--         type = get_term_type(buf),
+--         channel_id = chan_id,
+--       }
+--       table.insert(terms, term)
+--     end
+--     ::continue::
+--   end
+--   return terms
+-- end
+--
+-- ---For ipython sending
+-- local cpaste_start = '%cpaste -q\n'
+-- local cpaste_end = '--\n'
+-- local cpaste_pause = 10
+--
+-- ---Send lines to a terminal
+-- ---@param lines string[]
+-- ---@param term Terminal
+-- ---@return nil
+-- local send_lines = function(lines, term)
+--   local chan_id = term.channel_id
+--   local text = table.concat(lines, '\n') .. '\n'
+--   if term.type == 'ipython' then
+--     vim.fn.chansend(chan_id, cpaste_start)
+--     vim.uv.sleep(cpaste_pause)
+--   end
+--   vim.fn.chansend(chan_id, text)
+--   if term.type == 'ipython' then
+--     vim.fn.chansend(chan_id, cpaste_end)
+--   end
+-- end
+--
+-- local s = [[
+-- print("hello world!")
+-- def hello():
+--   print("hello")
+-- hello()
+-- ]]
+--
+-- local ls = { s }
+--
+-- ---Connect current buffer to a terminal
+-- local connect = function()
+--   local bufnr = vim.api.nvim_get_current_buf()
+--   local terms = list_terminals()
+--   vim.ui.select(terms, {
+--     prompt = 'Select terminal',
+--     format_item = function(item)
+--       return item.type .. ' ' .. item.bufnr
+--     end,
+--   }, function(choice)
+--     if choice == nil then
+--       return
+--     end
+--     M.buf_term_map[bufnr] = choice
+--   end)
+-- end
+--
+-- M.send = function(lines)
+--   local bufnr = vim.api.nvim_get_current_buf()
+--   local term = M.buf_term_map[bufnr]
+--   if not term then
+--     connect()
+--     return
+--   end
+--   send_lines(lines, term)
+--   -- scroll to the bottom
+--   local term_win = vim.fn.bufwinid(term.bufnr)
+--   local n = vim.api.nvim_buf_line_count(term.bufnr)
+--   vim.api.nvim_win_set_cursor(term_win, { n, 0 })
+-- end
+--
+-- M.send_visual = function()
+--   -- get the selected text
+--   vim.cmd.normal { '"zy', bang = true }
+--   local selection = vim.fn.getreg 'z'
+--   M.send { selection }
+-- end
+--
+-- vim.keymap.set('v', '<CR>', function()
+--   M.send_visual()
+-- end, { noremap = true, silent = true })
+--
+-- -- connect
+-- vim.keymap.set('n', '<leader>ct', function()
+--   connect()
+-- end, { noremap = true, silent = true })
 
----A terminal has a buffer number, a type and a channel id
----@class Terminal
----@field bufnr integer
----@field type string?
----@field channel_id integer
+local M = {}
 
----Get the channel id of a terminal buffer
----@param bufnr integer
----@return integer|nil
-local function get_channel_id(bufnr)
-  return vim.api.nvim_get_option_value('channel', { buf = bufnr })
+local function new_terminal(lang)
+  vim.cmd('vsplit term://' .. lang)
 end
 
----Get the type of the terminal buffer
----like ipython, R, bash, etc.
----based on the buffer name
----@param buf integer
----@return string|nil
-local function get_term_type(buf)
-  local name = vim.api.nvim_buf_get_name(buf)
-  local term_type = name:match 'term://.*/%d+:(.*)'
-  if not term_type then
-    return nil
-  end
-  -- drop flags like --no-confirm-exit
-  term_type = term_type:match '([^%s]+)'
-  -- drop the path to the executable
-  term_type = term_type:match '([^/]+)$'
-  return term_type
+function M.new_terminal_python()
+  new_terminal 'python'
 end
 
----Find nvim terminal buffers
-local function list_terminals()
-  local terms = {}
-  for _, buf in ipairs(vim.api.nvim_list_bufs()) do
-    if vim.api.nvim_buf_is_valid(buf) and vim.api.nvim_get_option_value('buftype', { buf = buf }) == 'terminal' then
-      local chan_id = get_channel_id(buf)
-      if not chan_id then
-        goto continue
-      end
-      ---@type Terminal
-      local term = {
-        bufnr = buf,
-        type = get_term_type(buf),
-        channel_id = chan_id,
-      }
-      table.insert(terms, term)
-    end
-    ::continue::
-  end
-  return terms
+function M.new_terminal_r()
+  new_terminal 'R --no-save'
 end
 
----For ipython sending
-local cpaste_start = '%cpaste -q\n'
-local cpaste_end = '--\n'
-local cpaste_pause = 10
-
----Send lines to a terminal
----@param lines string[]
----@param term Terminal
----@return nil
-local send_lines = function(lines, term)
-  local chan_id = term.channel_id
-  local text = table.concat(lines, '\n') .. '\n'
-  if term.type == 'ipython' then
-    vim.fn.chansend(chan_id, cpaste_start)
-    vim.uv.sleep(cpaste_pause)
-  end
-  vim.fn.chansend(chan_id, text)
-  if term.type == 'ipython' then
-    vim.fn.chansend(chan_id, cpaste_end)
-  end
+function M.new_terminal_ipython()
+  new_terminal 'ipython --no-confirm-exit --no-autoindent'
 end
 
-local s = [[
-print("hello world!")
-def hello():
-  print("hello")
-hello()
-]]
-
-local ls = { s }
-
----Connect current buffer to a terminal
-local connect = function()
-  local bufnr = vim.api.nvim_get_current_buf()
-  local terms = list_terminals()
-  vim.ui.select(terms, {
-    prompt = 'Select terminal',
-    format_item = function(item)
-      return item.type .. ' ' .. item.bufnr
-    end,
-  }, function(choice)
-    if choice == nil then
-      return
-    end
-    M.buf_term_map[bufnr] = choice
-  end)
+function M.new_terminal_julia()
+  new_terminal 'julia'
 end
 
-M.send = function(lines)
-  local bufnr = vim.api.nvim_get_current_buf()
-  local term = M.buf_term_map[bufnr]
-  if not term then
-    connect()
-    return
-  end
-  send_lines(lines, term)
-  -- scroll to the bottom
-  local term_win = vim.fn.bufwinid(term.bufnr)
-  local n = vim.api.nvim_buf_line_count(term.bufnr)
-  vim.api.nvim_win_set_cursor(term_win, { n, 0 })
+function M.new_terminal_shell()
+  new_terminal '$SHELL'
 end
 
-M.send_visual = function()
-  -- get the selected text
-  vim.cmd.normal { '"zy', bang = true }
-  local selection = vim.fn.getreg 'z'
-  M.send { selection }
-end
+return M
 
-vim.keymap.set('v', '<CR>', function()
-  M.send_visual()
-end, { noremap = true, silent = true })
-
--- connect
-vim.keymap.set('n', '<leader>ct', function()
-  connect()
-end, { noremap = true, silent = true })
+-- The line beneath this is called `modeline`. See `:help modeline`
+-- vim: ts=2 sts=2 sw=2 et
diff --git a/lua/kickstart/plugins/treesitter.lua b/lua/kickstart/plugins/treesitter.lua
index d50d4fa..26b4b5e 100644
--- a/lua/kickstart/plugins/treesitter.lua
+++ b/lua/kickstart/plugins/treesitter.lua
@@ -14,7 +14,7 @@ return {
     main = 'nvim-treesitter.configs', -- Sets main module to use for opts
     -- [[ Configure Treesitter ]] See `:help nvim-treesitter`
     opts = {
-      ensure_installed = { 'bash', 'c', 'diff', 'html', 'latex', 'lua', 'luadoc', 'markdown', 'markdown_inline', 'query', 'r', 'vim', 'vimdoc' },
+      ensure_installed = { 'bash', 'c', 'diff', 'html', 'latex', 'lua', 'luadoc', 'markdown', 'markdown_inline', 'query', 'r', 'vim', 'vimdoc', 'yaml' },
       -- Autoinstall languages that are not installed
       auto_install = true,
       highlight = {