Mac commonly used shortcuts

Ref[1] contains a complete list of MacOS shortcuts. Here I list a few commonly used ones from it.

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.
Command–Up          Arrow Move the insertion point to the beginning of the document.
Command–Down Arrow  Move the insertion point to the end of the document.
Command–Left Arrow  Move the insertion point to the beginning of the current line.
Command–Right Arrow Move the insertion point to the end of the current line.
Control-A           Move to the beginning of the line or paragraph.
Control-E           Move to the end of a line or paragraph.

References
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1. Mac Keyboard shortcuts, https://support.apple.com/en-us/HT201236