Do you never have to terminate a stuck session? <enter>~. to do so is practically muscle memory. The other sequences I cannot remember either, since their frequency of use is several orders less for me, but ~? is pretty intuitive to find out.
Not the OP but I generally don't need to use <enter>~. because I have my terminal multiplexed in tmux so will kill the tmux pane rather than OpenSSH session.
The main reason I prefer to kill via tmux rather than OpenSSH is because sometimes I'll be connected several sessions deep (eg via a Bastian / SSH jumpbox or tmux itself might be running remotely) so the tmux kill is easier than having to remember whether I need to ~. or ~~.
But ultimate there is no right nor wrong way to do things here, it's all just a question of preference and habit.
Typically I just wait for timeout, or open a new session (remote tmux session makes this quite painless). Plenty of other things to do, usually, waiting a couple minutes every week or three doesn't bug me enough to google.
