But there are variations. UK stocks are good - zero withholding. Note however that a small fee may be charged , e.g. when I held NGG I think it was something like a fee of 1.5 cents per share each time a dividend was paid. This is legit - ADR issuers are allowed to charge a small fee to help defray the costs of running the ADR program.

Best of luck and continue learning. And as I mentioned in a previous post make sure that you have your investment goals and underlying strategy clearly delineated - it really helps a lot.