You can begin to learn a language in various ways. For one, you can learn it in school and a language center, which is a good base for grammar especially. Secondly, you can study it on your own, maybe even by watching youtube videos, series/ movies, listening to music, etc. which is becoming more of a trend nowadays due to the high costs of studying at a language center. Moreover, you can learn it by starting a relationship with someone and figuring out a way to communicate after some time – I think it usually happens fast when you catch feelings (to start feeling emotions for someone) for someone who doesn’t speak the same language! Lastly, you can move to that country and pick it up there. I would say this is the best way, although many don’t have this opportunity.