How to learn a language effectively? I've heard that there are many different methods, and how to sort them out and find what I need, I have no idea.

This is my opinion too, because I'm not a specialist either, I didn't study to be a foreign language teacher at university. I'm just a student who needs knowledge. Among many platforms, I chose Promova just based on various google reviews and advice from friends and acquaintances. One of the few platforms that tailor a personalised programme for you.