Typing
/? somecommand
will always be faster than looking the command up in the text command directory or on a web page and will never require someone to open a browser (or walk away from a PS4 to look it up on a computer).
The /? command is singularly the most useful command in the game, and everybody should learn to use it.
For example,
/? micon
ALIASES:
/macroicon, /micon
USAGE:
/micon “icon name” [category]
→Displays the specified icon as a hotbar icon. If used twice in a single user macro, only the first instance will be recognized.