1. :s: Substitution
   • Syntax: :[range]s/pattern/relacement[/gci] where
   • Flags: gci
     • g: Catch & substitute all matches in a given line, not just the first (“Global”)
     • c: Ask user whether to substitute or not (“Confirm”)
     • i: Match pattern in case-Insensitive manner
   • e.g. :s/apple/banana/c substitutes the first “apple” in each line to “banana” after user confirmation
2. :g: Global command
   • Syntax: :[range]g/pattern/cmd where
     • pattern: (Regex) pattern to match a given line
     • cmd: Command to execute on each matched line
   • e.g. :g/^\t\t/d deletes all lines starting with 2 tabs
3. :v: Global non-match command
   • Useful example: :v/./d to remove any unwanted empty line (since any non-empty line would be matched)
4. Other tips
   • Wrapping a word or phrase with \<, \> forces to match that word or phrase exactly (occurrence as partial words are ignored)

Reference:

• https://vim.fandom.com/wiki/Power_of_g
• https://vim.fandom.com/wiki/Search_and_replace
• https://vim.fandom.com/wiki/Remove_unwanted_empty_lines