How do I know if my Wallet is ERC20?

I'm just starting to dip my toes into the cryptocurrency world, and I'm trying to wrap my head around all the different wallets and tokens. One thing that's really confusing me is ERC20 tokens. I've heard a lot about them, but I'm not sure how to check if my wallet supports them or not. Can you help me out? I've downloaded a few wallets on my phone and desktop, but I'm not sure which ones are ERC20 compatible. Is there a way to tell just by looking at the wallet interface or do I need to dig deeper into the technical details? Also, I've read that some wallets can hold multiple types of tokens, including ERC20. How do I know if my wallet can do that? And if it can, how do I add ERC20 tokens to it? I'm still pretty new to this, so please explain it in a way that's easy to understand. Thanks in advance for your help!