Generac generator usage and tripped breakers

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Or does it depend on the size and if I’m overloading it?

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This. Your home panel has thermal magnetic breakers, meaning they protect against short circuits or overloads. For example, if you put 25A on a 20A breaker it will trip due to overload but not instantaneously. If you short a 20A breaker and it sees 1000A it will trip instantaneously.

I don't think your power source would have anything to do with branch breakers tripping.

Now I do know that generators vary on the THD (total harmonic distortion) rating, meaning how clean the power is. The cheaper ones may put out dirty power that can screw up electronics. That could be part of it.

I would troubleshoot exactly what the issue is here. I doubt it's a tripped breaker but could be wrong.

Whole home generator or smaller one?

My fridges and freezers need to be run on my inverter generators.

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Wife just called me and told me that the refrigerator and freezer were not working and I suspected tripped breakers

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If either or both have "Eco" modes, make sure they are running in that mode. That turns off the door and defrost heaters which take up far more power than the compressor does while in the cooling cycles. On my fridge for example, the cooling cycle uses 110 - 125W while defrost cycle uses closer to 500W.

My fridge was doing the same thing on my portable generator with nothing else plugged in. It has GFCI outlets on the generator. I think certain fridge compressors don’t play nice with the ground and cause GFCI to trip. I may have had too long or too small of an extension cord but it didn’t trip the GFCI right away. I did some googling and a possible work around could be to use a plug adapter that switches plug from 3 prong to 2 prong. I didn't love this idea so I’m currently working on using the 30 amp outlet and breaker interlock system to prevent the same problem in the future.

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Was there a breaker tripped or not

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Yes