Always check if the "free" version allows for commercial use (monetized videos).
However, using copyrighted music without permission can lead to "strike" notices or your videos being muted. To avoid legal headaches, you need to look for tracks under Creative Commons licenses or Public Domain.
This doesn't always mean "free." It means you pay once (or not at all) and don't have to pay "royalties" every time the video is played.
If you'd like, I can help you by looking for: Music for a specific genre (Lo-fi, Cinematic, Horror, etc.) Tracks that don't require any attribution at all
Background music should sit at around -18db to -25db so it doesn't drown out your voice.
Use fast-tempo tracks for tutorials and slow, ambient tracks for storytelling.
Run by Kevin MacLeod, the most famous name in royalty-free music.
