PgUp and PgDn scrolls up and down, the /ss command decides how much
Up and Down goes through the history of text you've written
Tab completes a nickname after writing the first couple letters
CTRL-A switches to the previous channel
CTRL-X switches to the next channel
CTRL-E is the /a command, jumps to the oldest unread message in another channel, or alt-tabs between two channels otherwise
CTRL-L is the /r command, redraws the screen to fix corruption. Use this if things are glitchy after resizing the terminal
CTRL-N is the /v command, toggle visibility of names in messages
CTRL-K followed by a number 0-9 or letter a-f changes colour mid-message, see /cmap
CTRL-B enables bold/bright text
CTRL-O changes back to default colour