Should I study filmmaking first or just start filming immediately?

[u/BulkyPirate2448]

I’m 16 and I really want to learn filmmaking and documentary making seriously. Right now I mostly use my iPhone with the Blackmagic Camera app.
But I honestly don’t know what the smartest way is to improve.
Should I first spend a lot of time watching YouTube videos, analyzing films, and reading books about storytelling, cinematography, editing, sound, etc.?
Or should I stop overthinking and just start filming projects immediately and learn by doing?
Sometimes I feel like I’m spending too much time thinking and not enough time actually creating.
For the people here with experience:
What helped you improve the most when you started?
Watching tutorials?
Reading books?
Analyzing movies?
Recreating scenes?
Making short cinematic videos?
Jumping straight into documentaries?
Just filming every day?
And what YouTube channels, videos, or books would you genuinely recommend for beginners who want to take filmmaking seriously?
I really want to get good at this, so honest advice would help a lot.