Lol im dumb... forgot it was a 2 pt question.

Cheap way is to buy a surge protector/ power strip with surge protector.

Plug in appliances/lights that burn out faster than others. Periodically check surge protector to see if the internal breaker has been tripped.

Fancy way is to buy a multimeter and monitor voltage when large appliances turn on/off. That's usually the most likely culprit for voltage spikes (as your home grid has to compensate for sudden increase in usage, which in turn causes voltage to fluctuate slightly)