To highlight keywords turn on hl-todo-mode in individual buffers
or use the the global variant global-hl-todo-mode.
This package also provides commands for moving to the next or
previous keyword, to invoke occur with a regexp that matches all
known keywords, and to insert a keyword. If you want to use these
commands, then you should bind them in hl-todo-mode-map, e.g.:
(define-key hl-todo-mode-map (kbd "C-c p") 'hl-todo-previous)
(define-key hl-todo-mode-map (kbd "C-c n") 'hl-todo-next)
(define-key hl-todo-mode-map (kbd "C-c o") 'hl-todo-occur)
(define-key hl-todo-mode-map (kbd "C-c i") 'hl-todo-insert)See this list on the Emacswiki for other packages that implement the same basic features, but which might also provide additional features that you might like, but which I don't deem necessary.