General

• Space *: Search for word under cursor
• Space t F toggles auto-fill-mode, which enables hard wrapping
• C-x f calls set-fill-column - sets the column to wrap at
• g q to format (applies wrapping if auto-fill-mode enabled)
• Space s c clears search term
• * e edit word under cursor and change all in file/display (depending on mode)
• Space f y echo and yank filename for current buffer
• Space w . enters a mini-mode for editing windows - good for keyboard resizing and rearranging
• v i <char> selects everything between surrounding character
• t <char> like f but move forward to next character before <char>
• Space C-i jump forward (like C-i in Vim)

Intero

• Space u C-c C-t inserts type of thing under cursor above