My personal vim configuration

.vimrc

"====================================================================
" Leader key
"====================================================================
" Remap the leader key.
" let g:mapleader = "\<space>"
let g:mapleader = ";"


"====================================================================
" Edit and reload .vimrc
"====================================================================
nnoremap conf :e $MYVIMRC <cr>
nnoremap confs :source $MYVIMRC <cr>


"====================================================================
" Appearance
"====================================================================
" Nicer vertical lines.
set fillchars+=vert:\▏

set bg=dark
colo darcula

syn enable
syn on
au BufNewFile,BufRead *.{json} setlocal syntax=off

"====================================================================
" Sane editor settings
"====================================================================
" Relax file compatibility restriction with original vi.
" (Not necessary to set with neovim, but useful for vim.)
set nocompatible

" Save everything when switching buffers/windows/etc.
set autowriteall

" Disable beep / flash.
set vb t_vb=
set novisualbell  "vb:
set noerrorbells  "eb
set backspace=indent,eol,start

set tabstop=2
set shiftwidth=2
set autoindent
set expandtab "replace tabs w/spaces; don't forget to use retab after
" Allow cursor to move to beginning of tab.
" Will interfere with soft line wrapping (set nolist).
"set list lcs=tab:\ \

set cin
filetype plugin indent on

" Enable line and column display.
set ruler

" Line numbering.
" Toggle set to <esc>n in Behavior section.
set nonumber

" Disable line wrapping.
" Toggle set to <esc>w in Behavior section.
set nowrap

" Disable showmode if using vim-airline; otherwise use 'set showmode'.
set showmode

" File type recognition.
filetype on
filetype plugin on
filetype indent on

" Scroll a bit horizontally when at the end of the line.
set sidescroll=6

"====================================================================
" Behavior
"====================================================================
" Shorten from default 2 seconds.
set timeoutlen=1000

" Capture mouse (prevents tmux from scrolling out of vim).
set mouse=a

" Use jj to esc in insert mode.
inoremap jj <esc>

" Highlight matches when searching.
" Use <esc><esc> to clear.
set hlsearch
" Redraw screan and clear search highlighted items.
" http://stackoverflow.com/questions/657447/vim-clear-last-search-highlighting#answer-25569434
" nnoremap <silent> <c-L> :nohlsearch<cr><c-L>
nnoremap <silent> <esc><esc> :nohlsearch<cr><c-L>

" Visual matching for :e.
set wildmode=list:longest

" Toggle line numbers.
nnoremap <silent> <esc>n :set number! number?<CR>

" Toggle line wrap.
nnoremap <silent> <esc>w :set wrap! wrap?<CR>

" Toggle syntax.
noremap <silent> <esc>s :if exists("g:syntax_on") <bar>
        \   syntax off <bar>
        \ else <bar>
        \   syntax on <bar>
        \ endif <cr>

" Save.
inoremap <d-s> <C-o>^:update<cr>gi

"====================================================================
" Buffers
"====================================================================
nnoremap <silent> <leader>w :w<cr>

" Go to next buffer.
nnoremap <silent> <leader>n :bn<cr>
inoremap <silent> <leader>n <esc>:bn<cr>

" Go to previous buffer.
nnoremap <silent> <leader>p :bp<cr>
inoremap <silent> <leader>p <esc>:bp<cr>

" Toggle buffer (switch between current and last buffer).
nnoremap <silent> <leader>bb <C-^>

" Close buffer.
nnoremap <silent> <leader>d :bd<cr>
inoremap <silent> <leader>d <esc>:bd<cr>

" Kill buffer (ignore edits).
nnoremap <silent> <leader>d! :bd!<cr>
inoremap <silent> <leader>d! <esc>:bk<cr>

" List buffers and select.
nnoremap <silent> <leader>bl :ls<cr>:buffer<space>
inoremap <silent> <leader>bl <esc>:ls<cr>:buffer<space>

" Select buffer.
" Press <tab> after <leader>b to execute right away.
nnoremap <silent> <leader>b :buffer<space>
nnoremap <silent> <enter> :CtrlPBuffer<enter>

" Forward and back.
nnoremap J <c-f>
nnoremap K <c-b>

" H, M, and L move the cursor to top, middle, and bottom of the
" screen, but the following scrolls the buffer contents so that
" the line under the cursor is shifted to the top, middle, or
" bottom.

nnoremap gt H
nnoremap gm M
nnoremap gb L

nnoremap mt zt
nnoremap mm zz
nnoremap mb zb


" Go to buffer number
" ===================
" => enter #<enter> to go to buffer # quickly, where # is 1..9
let c = 1
while c <= 9
  execute "nnoremap " . c . " :b" . c ."<cr>"
  let c += 1
endwhile

" => enter <leader># to go to buffer #, where # is 1..9
let c = 1
while c <= 9
  execute "nnoremap <leader>" . c . " :b" . c ."<cr>"
  let c += 1
endwhile

" => enter #b to go to buffer #, where # is 1..99
let c = 1
while c <= 99
  execute "nnoremap " . c . "b :b" . c . "<cr>"
  let c += 1
endwhile


"====================================================================
" Windows
"====================================================================
" Prefer opening windows to right and below
set splitright
set splitbelow

" Split horizonal with new buffer.
" (The divider is horizontal, the buffers are stacked)
nnoremap <silent> <leader>- :new<cr>

" Split vertical with new buffer.
" (The divider is vertical, the buffers are side-by-side)
nnoremap <silent> <leader>\ :vnew<cr>

" Close window.
nnoremap <silent> <leader>c :close<cr>
inoremap <silent> <leader>c <esc>:close<cr>

" Improved keyboard navigation.
nnoremap <leader>hh <c-w>h
nnoremap <leader>jj <c-w>j
nnoremap <leader>kk <c-w>k
nnoremap <leader>ll <c-w>l

nnoremap <esc-h>h <c-w>h
nnoremap <esc-j>j <c-w>j
nnoremap <esc-k>k <c-w>k
nnoremap <esc-l>l <c-w>l

inoremap <silent> <leader>hh <esc><c-w>h
inoremap <silent> <leader>jj <esc><cr><c-w>j
inoremap <silent> <leader>kk <esc><c-w>k
inoremap <silent> <leader>ll <esc><c-w>l

" Resize horizontal splits (change height).
" <c-w><s--> and <c-w><s-=> only shift one line at a time (too slow)
nnoremap <silent> <leader>_ :exe "resize " . (winheight(0) * 2/3)<cr>
nnoremap <silent> <leader>+ :exe "resize " . (winheight(0) * 3/2)<cr>

" Resize vertical splits (change width).
" <c-w><s-,> and <c-w><s-.> only shift one line at a time (too slow).
nnoremap <silent> <leader>< :exe "vertical resize " . (winwidth(0) * 2/3)<cr>
nnoremap <silent> <leader>> :exe "vertical resize " . (winwidth(0) * 3/2)<cr>

" Resize everything evently
nnoremap <silent> <leader>0 <c-w>=


"====================================================================
" Terminal
"====================================================================
" Start terminal in insert mode.
au Bufenter * if &buftype == 'terminal' | :startinsert | endif

" New terminal below.
nnoremap <silent> <leader>; :botright terminal<cr>


" New terminal to the right.
nnoremap <silent> <leader>, :vertical terminal<cr>
tnoremap <silent> <leader>, <c-w>:vertical terminal ++close<cr>

" Navigation
tnoremap <leader>hh <c-w>h
tnoremap <leader>jj <c-w>j
tnoremap <leader>kk <c-w>k
tnoremap <leader>ll <c-w>l

" Go to previous / next buffer
tnoremap <leader>p <c-w><c-p>
tnoremap <leader>n <c-w><c-n>

" toggle buffer (switch between current and last buffer).
tnoremap <silent> <leader>bb <C-^>

" Close terminal
" ==============

" Enter terminal "normal" mode.
tnoremap <silent> <esc> <c-\><c-n>

" Close window but don't terminate the shell buffer (can go back to it later)
tnoremap <silent> <leader>; <c-w>:close!<cr>

" Close window and terminate the shell.
tnoremap <silent> <leader>c <c-w>:bd!<cr>


"====================================================================
" netrw explorer
"====================================================================
" https://vonheikemen.github.io/devlog/tools/using-netrw-vim-builtin-file-explorer/
" https://shapeshed.com/vim-netrw/
" http://ellengummesson.com/blog/2014/02/22/make-vim-really-behave-like-netrw/
let g:netrw_banner = 0
let g:netrw_keepdir = 0
let g:netrw_liststyle = 3
let g:netrw_browse_split = 0
let g:netrw_altv = 1
let g:netrw_winsize = 25
"augroup ProjectDrawer
"  autocmd!
  " autocmd VimEnter * :Vexplore
"augroup END
let g:netrw_localcopydircmd = 'cp -r'
hi! link netrwMarkFile Search
"nnoremap mm :Lexplore %:p:h<CR>
nnoremap m; :Lexplore<CR>

"====================================================================
" Plugins
" mkdir -p ~/.vim/pack/plugins/start
" git clone --depth=1 REPO ~/.vim/pack/plugins/start/REPO-NAME
"====================================================================
" CtrlP: https://github.com/ctrlpvim/ctrlp.vim
"let g:ctrlp_map = '<c-p>'
let g:ctrlp_map = '\'
let g:ctrlp_cmd = 'CtrlP'
let g:ctrlp_root_markers = ['.git', 'package.json', 'tsconfig.json']
let g:ctrlp_working_path_mode = 'ra'

let g:ctrlp_prompt_mappings = {
  \ 'PrtSelectMove("j")':   ['<s-j>', '<down>'],
  \ 'PrtSelectMove("k")':   ['<s-k>', '<up>'],
  \ }

My JetBrains vim plugin configuration: .ideavimrc.

Explanation of keys here.