~And I think poker courses are not really that relevant as people get to know more and develop more skills in poker games if they often play it in casinos. I’m not saying that these courses are useless, but people actually learn more from their own experience.
It can be true of some things, but not about poker. Yes, you could learn a lot from your own experience if you were someone playing 20 tables at ones, 10 hours per day for 20 years, but it would be much easier, and faster, to learn how to play from a pro.
Well, actually that is an old discussion and after having played for a long time and having read a lot in poker forums, I could assure that there is an equivalence according to which studying poker is equivalent to many hours of practice. So if you want to learn and advance the best thing you can do is to study and play.
In low levels, when you start it is not so important but when you go up levels, and more with how hard the tables are nowadays, there are players who spend more time studying than playing.
If you're really interested in learning poker, you could do both things, study and play. It could be a quite long process of learning but you can also understand things easily if you will apply the things that you're learning through studying. You can't do poker perfectly for the first time but you can enjoy and be pro as you make it as a part of your habit.