PokerStars for beginners
My opinion only, that PokerStars is the best site to start with. If you are lucky enough to play there.
USA players are not allowed to play on PS. I presently waiting for them to return to the USA.
Why do I say this: Poker Stars has many options to chose from. So, the beginner can play many games at many buy ins. In addition, the beginner can start in the low money games (micro games that may fit your BR) and increase the amount of buy ins, as your poker skills increase.
Start low until you are winning consistently. Then, move up to the next level, etc. If you move to the next level and start to lose, move back to the lower lever again until your poker playing skill increase. And, then move on up again.
Also, PokerStars has a good reputation for paying out, also. Which is more that can be said for some of the other sites.
Good luck, and keep on improving your poker skills.