Q | How to zoom in or out on Mac

To zoom your canvas, you can use the + en – buttons in the upper left corner of the canvas.
Zoom all of your screen is also a possibility.

What hotkeys to use?

If these keys combinations don’t work, you probably didn’t set up zoom. Go to the support section of Apple: https://support.apple.com/en-in/HT210978 (How to zoom in or out on Mac)