Mac keyboard shortcuts — Apple Support:

Fn–Up Arrow: Page Up: Scroll up one page.

Fn–Down Arrow: Page Down: Scroll down one page.

Fn–Left Arrow: Home: Scroll to the beginning of a document.

Fn–Right Arrow: End: Scroll to the end of a document.

I keep forgetting that the FN key is usable on the laptop. It’s like a magic control key.