I learned Fusion360 by using it. I had no real experience with 3D modeling beyond a little bit of TinkerCAD work for really basic 3D prints, and SketchUp for very basic architectural plans.
As I modeled things in Fusion, if I wanted to do something but didn't know how I'd search YouTube for a tutorial to do that specific task. Now I'm making fairly complex, decent looking, models. Here are my public ones that aren't solving a very specific problem that I have https://www.printables.com/@WhoaFactorial_912016/models, many of these are a a half day or so of modeling to get the basic shape right, then another couple of hours of tweaking for perfect fit.
Get good calipers, they'll make modeling so much better because you'll have good measurements to go off of.
As I modeled things in Fusion, if I wanted to do something but didn't know how I'd search YouTube for a tutorial to do that specific task. Now I'm making fairly complex, decent looking, models. Here are my public ones that aren't solving a very specific problem that I have https://www.printables.com/@WhoaFactorial_912016/models, many of these are a a half day or so of modeling to get the basic shape right, then another couple of hours of tweaking for perfect fit.
Get good calipers, they'll make modeling so much better because you'll have good measurements to go off of.