Learning from a good teacher, he or she can teach you right things.

Being patient is the key to learn a new language

Advice from a youtuber called Энциклоп (Encyclop), that have been given when he started Finnish:

Personally, practice, practice and more practice! Good teachers. A lot of exposure to the language through films, videos... But finally moving to the country where the language is spoken helped me the most for sure.

For me it's like going to the gym to build a good body, you just have to repeat what you're doing until you get what you want. I usually repeat videos, music lyrics, scenes of a movie, I repeat it chatting with me each word or phrase until I don't have to think on the learning language because I know it already.