Check if there is a community bicycle workshop where you live. They’re usually run by volunteers in universities where they have all the tools, you come with yo

Check if there is a community bicycle workshop where you live. They’re usually run by volunteers in universities where they have all the tools, you come with your bike, tell them what you want to fix or adjust, they show you how to do it, and then you do it yourself. They usually let you bring your own parts or have a stash of used parts. That’s how I learned almost everything I know on the subject and it didn’t even take that long to learn. And the park tools videos are very well done.