I believe what you are saying; there are many trading courses that are free, and we can get ideas without spending any money. Which is not like others who have to pay for seminars and then what will be taught is only basic or verbal.
I've watched a lot of things on YouTube that I can tell if I've learned anything, and the others I'm going back and forth on because, when I analyze them, their explanations are true.
There is no harm in going for courses that are freely available over internet. Such courses may give you some useful points that can help you in trading over period of time. Trading or investment is about creating a strategy that can guide you throughout your journey and this strategy must be developed by your own mind. It's best to train your mind through different techniques i.e. by doing actual trading, watching online courses etc. The sooner your mind is trained, better it is for your future investment/trading.