What C-] does
Jump to a definition
What C-t does
Jump back in a tag stack
What gC-] does
If more than one option, show possibilities
What :tselect does
Pull the list of possible tag matches
What :tnext / :tprev /:tfirst / :tlast do
Jump next/ previous/ first/ last match for the multiple tag matches
What :tag{tag} does
Jump to a definition of a {tag}
What :tjump{tag} does
If more than one option for {tag}, show possibilities