If you’re going to be doing some (or all) your getting about via a bike you’re probably going to need to learn how to do a few simple adjustments and repairs on your bike. And you’re definitely going to need some tools to do those repairs. Thankfully, Seth at Seth’s Bike Hacks has us covered for that. Seth’s Bike Hacks is a great channel and has a bunch of videos that do a wonderful job explaining tools and repairs. I highly encourage you to check him out.
Park Tool also has a, freaking, encyclopedia (remember those) of high quality repair videos.