Theres only few whose willing to teach by heart unless you pay them. Mentorship isnt always free but if you got a friend whose willing to teach you then better. But in this time, you can actually learn it by continuous watching or understanding the concept of trading. Its not that hard if you just focus. Dont just join signal for trading cause those guys arent really teaching but giving only you a potential market signal.
Not many successful traders will be willing to share their ideas and strategies even if they are paid. Their are many online mentors who are charging people for their services but I don't think their is much benefit in following these mentors as their aim is to gather money and they themselves are nor a successful trader.
If you are successful in finding a good mentor then it's fine those who don't should try to figure out themselves how to get success in trading. It's of no use to follow signalling groups and self proclaimed mentors.