How to see PC avatars with Quest or Quest 2?

So my friend is planning on getting either a Quest or Quest 2. My question and problem is, How do they see PC worlds and PC avatars?

Does it work based on the same principle as for PC users and Vive, Rift S, and Index users?

Do they need the cables that normally plug into a PC for them to actually be able to see PC avatars and PC worlds?

Any and all information would be extremely useful!!

I’m afraid the cable is the only way. I have looked all over the internet, and it says Windows 10 only. No shortcuts. So people like me who are poor have to just get by with a bunch of plain colored robots in VRChat :frowning: