In the spirit of Atomic Habits, I pick one new keyboard shortcut to practice each week. I use many of these daily:

Google Suite

• ⌘⌥M — Add a comment
• ⌘⇧↑ / ⌘⇧↓ — Foreground/background image (Slides)

macOS Finder

• ⌘N — New window
• ⌘⇧N — New folder

Firefox

• ⌘l — Jump to nav bar
• ⌘w — Close tab
• ⌘t — New tab

VS Code

• ⌥ + click - Add a second cursor

Many programs

• ⌘[ / ⌘] - Indent up or down 1 level