If you’re making a video, it’s quite possible that you might want to put some background music in it. Whatever you do, never use music whose source is unknown. It’s not hard to identify music; I recently put a radio clip on YouTube which began with about 3 seconds of a record fading out. I instantly received a message from the site saying I’d used copyrighted music.
5 Free Music For Commercial Use Resources on the Neil Patel blog is a recent article which can point you in the direction of some music that won’t have the lawyers at your door. There’s plenty more online if you look for it, and if you need music often, there are whole libraries you can buy, designed for background music and not costing much at all.