The text system also has a basic kill-yank separate from copy paste. So you can Ctrl-K to kill a line, then Ctrl-y to yank it out elsewhere in basically every text input in the OS.
Oddly this is actually nicer in macOS than Linux desktops, because Ctrl-A is normally reserved for "select all" on other OSes. Because macOS puts all the "normal" select/cut/copy/paste combos on the command key, the full set of Unixy movement keys is available on the control key.
Gnome tweaks has a setting to enable Emacs keyboard for GTK apps. It's pretty good and supports things like M-f and M-p better than mac (which uses Option for special characters). But it does confuse some programs that don't expect it. Like Gedit doesn't seem to have a functioning Find shortcut in this mode. (It uses C-s for save so C-s for search doesn't work)
