At this time, is it possible for a beginner to learn bitcoin, where is it better, which courses are effective?
If you stay in this forum for a few months and read the information in some of the links that have been posted in this thread you will learn the basics of Bitcoin. After learning the basics, it is now up to you to choose the area you want to specialize in. You might decide to be a specialist in bitcoin mining, trading, or other areas. The field of Bitcoin is too wide which is why you have to focus on one or more areas.
The important thing is that you understand that Bitcoin is not an asset to speculate on but a means of peer to peer payment.
I don't see anything wrong to treat Bitcoin as an asset because most of countries in this world doesn't accept Bitcoin as a currency, if you live in such countries and use Bitcoin as a currency, you're either can't buy anything with Bitcoin or someone report you to the police.
Either you're using Bitcoin as an asset or as a payment, you're part of Bitcoin adoption.
Just like any other investment Bitcoin is a big time asset. Currently, there are just a few assets that are reliable and profitable than Bitcoin. We have seen the price of bitcoin moving up in few months and many hodlers have made some profit from this upward movement.