Never having made a deposit on any site, I have always stuck to freerolls to start with and when I couldn't find any I would use Play Money to practice, There are differences of opinion when playing both these type of games, because they are not always taken seriously by many players, but in my view it really doesn't matter what others do, it's You! and how seriously You play these games.
Don't let others influence how you learn how to play, That is down to how You Learn!
Teachers of anything will agree that there are 3 different ways to Learn anything, You either have to read about the Subject, Watch others do the Same, or get your
hands on and do it for yourself. I Prefer to use all 3 especially when it comes to Poker I have read many books on the Game, Watched 1,000s of games on Twitch TV and YouTube, and played many Thousands of hands over the last 20 years maybe as many as Hundreds of Thousands.
I have lost many, but I have always made Profit over those years On-line and especially in Live games.
The most Famous Quote by anyone was Doyle Brunson when asked How he learned to be so good and he replied "You can Learn Poker in 5 Minutes, But it takes a Lifetime to Master, I'm still Learning"