Where can I download Forge maps

I’ve seen a lot of the pros when they are streaming play on old maps like guardian, lockout and the pitt so I want to know where to download them so I can play customs with my friends because lets be honest the maps this game shipped with are lacking, apart from maybe Haven.

Also If I download them can my friends play on them too or will they have to download them too ?

thanks

btw I know about Forgehub but they’re site is about as useful as a chocolate teapot

same over here, all help appreciated.