Wow!
Thank you guys, I didn't expect such a massive response.

I'll make a brief research on all the topics you mentioned above, but my choice for today would be trading and maybe mining with my current PC, which is old, but hopefully would give necessary experience and knowledge. So yeh, I like to do things solidly.

As I understand trading is highly profitable but risky. So I'm thinking to invest some tiny amount of money, for example, 20 euros just to get the feeling of how it actually works.
Hopefully will succeed and continue with the business and of course, would like to continue asking questions and share the newbie experience with you:)