<C-o> - Exit insert mode for exactly one move
<C-o> - Use to go back after goto definition
<C-i> - Use to go back to definition
<C-hjkl> - Use ctrl + hjkl keys to focus buffers
<C-wv - Create vertical split
<C-ws - Create horizontal split
% - Jump to prev/next [] or () or {}
* - Jump through cword items
r - Change symbol
<C-a> - Increment number
<C-x> - Decrement number
diw - Delete word from any position
viwp - Replace word after previous move
ciw - also switch to insert mode
ci.. - Delete inside "" or () or {} and switch to insert mode
saiw.. - surround with "" or () or {}
sd.. - delete surrounding "" or () or {}
vas - Visual select blocks
va( - Visually select around ( symbol
dt( - Delete everything till ( symbol
gcc - Toggles the current line using linewise comment
gbc - Toggles the current line using blockwise comment
gc[count]{motion} - (Op-pending) Toggles the region using linewise comment
gb[count]{motion} - (Op-pending) Toggles the region using blockwise comment
: %s/old/new/gc - change in current buffer all matching words to new
In Visual select mode
'<,'>
: s/old/new - change inside selection only first matching for each line
: s/old/new/g - match and replace all
: s/old/new/gc - and also ask for each replace
:s/\<old\>/new/gi - replace exactly old word (older will ignored)