Delete

• di/da + ’(’/”{’ : delete the content in the brackets(i:exclude the brackets,a: include the brackets))
• : delete the brackets

Change

• gS + brackets : add brackets arround the selected contents (nvim-surround.nvim is needed)

Substitute

ot : origin text ; tt : target text

• :s/ot/tt/g : Substitute in current line, /g : Substitute all matched
• :%s/ot/tt/g : in whole file

Select

• V : current line
• <C-v> : select blocks
• ggVG : select whole file quickly

Buffers vs Windows

• :q ; quit current buffer
• :qa ; quit all buffer
• :sp ; the same buffer below