From https://www.perl.com/article/153/2015/2/16/Get-to-grips-with-GNU-Screen/ with some addition
# Type before other commands
Prefix: Control + a
Shortcuts menu: ?
New window: c Split Vertical: | Copy mode: [
Close window: k Split Horizontal: S Start copy: space
Next window: n Focus next region: tab Scroll up: u
Prior window: p Quit split screem: Q Scroll down: d
Jump window #: 0-9 End copy: space
List windows: " Paste: ]
Rename window: A End copy mode: escape
Detach: d
Quit: \
Save window layout: Ctrl-A :layout save default
# Terminal commands
Launch Screen: screen
Named session: screen -S <name>
List sessions: screen -ls
Re-attach session: screen -r [name]
some good info on how to make screen as good as tmux (or better, or not as good, who knows...) https://reversed.top/2015-11-08/switching-from-tmux-to-gnu-screen/