You got so many different advices.
If you want to learn, lake anywhere, two ways: yourself, or school.
If you take yourself it can take you and some 10 years to take off. If you go in school it will take you around 10 years to became an artist. The better school the less time after school will take you. Learning about composition will set you and many other questions, say perspective or working with light, or how to solve some artistical problem, ….
It is nothing different then how to become engineer or doctor. You can learn to twist the screw at the right torque, but it will not make you engineer. Nothing is different in art. Part time “artists” never made it, just like part time engineers or programmers.
If you wish to be an artist and learn many things turn your life. Rich is one that is happy not one that have money. Just “bite the bullet”.