General tips & tricks
Tutorials
https://www.youtube.com/@macmost
Default application per file type
To change the default application for a file type, select a file of the respective type with a right-click and choose 'Get Info'.
Next, click 'Open with,' select the respective application, and click 'Change All.'
Keyboard shortcuts
https://support.apple.com/en-us/HT201236
Navigation
https://support.apple.com/en-us/HT204100
https://support.apple.com/nl-nl/guide/mac-help/mh35869/13.0/mac/13.0
https://support.apple.com/nl-nl/guide/mac-help/mchlp2469/mac
https://support.apple.com/nl-nl/guide/mac-help/mchl534ba392/13.0/mac/13.0
Screenshots & screen recording
https://support.apple.com/en-us/HT201361
https://support.apple.com/en-us/HT208721
How to take a screenshot on your Mac
How to capture a portion of the screen
How to capture a window or menu
Use the Screenshot toolbar
Here you can also change the storage location of your screenshots from ~/Desktop to another folder.
Spotlight
https://support.apple.com/en-gb/guide/mac-help/mchlp1008/mac
Central search function of the Mac, essentially you can find everything in it, from applications to notes and from files to contacts.
Quick look
https://en.wikipedia.org/wiki/Quick_Look
https://www.iculture.nl/tips/quicklook-safari-mac/
Quick View function on your Mac, works in every standard Mac application. It allows you to quickly preview a file using the spacebar. This works, for example, in Finder (file manager), email attachments, etc.