How should I start learning video editing for Reels from scratch?

I want to learn video editing, especially short-form content like Instagram Reels, and eventually use this skill to freelance.

I’m a complete beginner and don’t know where to start.
What should I learn first? Should I just follow YouTube tutorials and practice, or take a structured course?

Also, where can I find raw footage to practice with, and what skills should I focus on to become good enough to get my first client?

If you were starting from zero today, what learning path would you follow?