Three-finger drag is the one thing I just can't live without.[0]
Finder: Cmd+Shift+G to navigate wherever I want (with autocomplete)
Text input: Control+Command+Space for the emoji list and search
Text input (switching keyboards for Japanese input): Control+Space for quick toggles
Text input (accents in my native language): all the accents and letters of various European languages are usually made by using Option+[key] for the accent, and Option+[key]+letter for the proper letter. The [key] maps are e -> ´, `` -> `` (I'm messing up the rendering of the quotes here despite my best efforts), i -> ˆ, u -> ¨ and some keys Option+[key] directly give a character when it's unique, such as Option+a=å and Option+o=ø, and Option+1=¡ (because it's the key for ! otherwise, which makes sense - and can help with Spanish)
For the longer examples, Option+e+e = é, Option+e+a = á, Option+`+a = à, Option+u+u = ü, Option+i+u = û, Option+n+n = ñ, etc.
Holding Option in menus also shows extra options and their shortcuts (although this is less and less the case outside of the Apple apps themselves). An example using Finder -> Edit and pressing/releasing the Option key[1]
Oh and one more: the app "Stickies", which allows you to have "post-it notes" with color coding and collapsing the note by double-clicking on the title, saving to file, etc. I use it to take quick notes or set casual reminders.
Last but not least, not an Apple app but a very helpful tool I've used to make the gif in this post: Kap is incredibly convenient to records bits of the screen and save to various formats, and it's been improving a lot since its early releases[2] (I have no stake in this, I'm just thankful for such a cool piece of free software)
[0] https://support.apple.com/en-us/HT204609
[1] https://i.imgur.com/feRhErF.gif
[2] https://getkap.co/
Finder: Cmd+Shift+G to navigate wherever I want (with autocomplete)
Text input: Control+Command+Space for the emoji list and search
Text input (switching keyboards for Japanese input): Control+Space for quick toggles
Text input (accents in my native language): all the accents and letters of various European languages are usually made by using Option+[key] for the accent, and Option+[key]+letter for the proper letter. The [key] maps are e -> ´, `` -> `` (I'm messing up the rendering of the quotes here despite my best efforts), i -> ˆ, u -> ¨ and some keys Option+[key] directly give a character when it's unique, such as Option+a=å and Option+o=ø, and Option+1=¡ (because it's the key for ! otherwise, which makes sense - and can help with Spanish)
For the longer examples, Option+e+e = é, Option+e+a = á, Option+`+a = à, Option+u+u = ü, Option+i+u = û, Option+n+n = ñ, etc.
Holding Option in menus also shows extra options and their shortcuts (although this is less and less the case outside of the Apple apps themselves). An example using Finder -> Edit and pressing/releasing the Option key[1]
Oh and one more: the app "Stickies", which allows you to have "post-it notes" with color coding and collapsing the note by double-clicking on the title, saving to file, etc. I use it to take quick notes or set casual reminders.
Last but not least, not an Apple app but a very helpful tool I've used to make the gif in this post: Kap is incredibly convenient to records bits of the screen and save to various formats, and it's been improving a lot since its early releases[2] (I have no stake in this, I'm just thankful for such a cool piece of free software)
[0] https://support.apple.com/en-us/HT204609
[1] https://i.imgur.com/feRhErF.gif
[2] https://getkap.co/