Earlier quoted context omitted.
For Apple 101-key keyboard users, who don’t have a “Home” key: try Cmd+Up (and Cmd+Down.) Bonus: also try Ctrl+E (and Ctrl+A) in text fields, or on the command-line. (Both of these carry over to iOS, if you’re curious. I just tested them with the iPad keyboard-folio thing.)
The actual keys are Fn+Left and Fn+End for Home and End (Fn+Up is PageUp, etc). These will also work in Terminal apps or other places that don’t have specific Cmd-Up / Down bindings.
Interesting aside: the “Globe” key on an iPad keyboard-folio (the one that opens the IME chooser) has some but not all of the properties of an Fn key. Globe+Left and Globe+Right work as PgUp/PgDn, but Globe+Up and Globe+Down do not work as Home/End. (Or maybe they do, but Home/End just aren’t bound in any app I’ve tested? I don’t want to write+deploy an iOS keysym tester just to find this out...)