I guess I am self educated in the area. I have visited my local librarys most of my life and books on metal working have been of primary interest. Check it out.
I also have purchased several texts including Machine Shop Practics, V1 and V2. Good reads.
Another good source of information are the magazines published by our host, Village Press: Home Shop Machinist and Machinist Workshop. I often read the magazines cover to cover, not because I am interested in every project. Frankly, I haven't built a single one. But to learn as much about the authors' techniques as possible.
And this board and that other one have taught me as much or more than all the books and magazines put together. Go back to the first message and start reading.
Of course, there is no substitute for hands on experience. Just make some parts. Then read some more. Then make more parts. Then read ... etc. If you have a problem and need advice on something, ask here. It's like having all the experts in several countries at your call.
Make it fit.
You can't win and there is a penalty for trying!