What does using right/left/up/down key and option/command key together mean?
⌘+← or → jumps to the left/right end of the current line
⌘+↑ or ↓ jumps to the top/bottom of the current page
⌥+← or → jumps to the left/right adjacent word
⌥+↑ or ↓ jumps to the start/end of the paragraph
(all terms are respective)