How do I teach my seven month old that he can’t have everything he wants? He’s been testing boundaries lately by trying to grab things and throwing a tantrum when we say no, take away things away or stop him from grabbing things.

I’m well aware that he’s still very young and I don’t think he’s doing anything deliberately but I do want to start teaching him “no”. Any tips?

Btw he’s not hungry or in pain just crying because we don’t let him grab our phone or dangerous things