I had used Sketchup for a few smaller 3D designs some time ago, mostly for mocking up woodworking projects. Then I wanted to design my workshop so that I could alter things and not have the model explode. Fusion 360 was what I learned.
Watched some videos, redesigned 2 of the woodworking projects that I had previously done in sketchup so that they were parametric, more to get used to the way of working, and then went from there. My workshop file ended up being quite complex with a vast array of formulae to calculate and number of different things so that I could, on a whim, decide to make my workshop have a 31 degree pitch roof instead of 30, and also make it 1 brick wider and 13mm taller and the whole model would recalculate. This included things like the birds mouths on the rafters, studs and other timbers being added or removed, noggins, headers, internal sheet goods for the walls all being resized to fit perfectly, even if odd sizes, etc etc. I was very happy with what I had learned and how well it turned out.
Start simple, work out how to make a cube with a cylinder sticking out the top and a couple of bevelled edges. Don't make it massive, you want to see the whole process through from design to slicing to printing. You're going to need to think about how 3D printers work best and where there issues lie in how you design or print things. For example, the face that is touching the print bed will print fine with 45 degree bevels on all sides. It won't look nearly as good if you try and print with a roundover because the initial layers have too large of an overhang with a standard layer height. Lowering it can help, but not always solve the issue.
Think about line widths and layer heights too when designing. Lets say you want to make a small pot to hold some screws. Flat base, 4 walls. Maybe think about making the walls (assuming you're using a 0.4mm nozzle) a multiple of 0.4 in width. Height is less of an issue, but still should be considered where possible.
If you hate the camera controls they can be changed, but only to some defaults to mimic other applications. I prefer the tinkercad option, not that I have ever used tinkercad, but it allows moving the view around without using the keyboard.
With all 3D modelling there is nearly always 3 or 4 ways of achieving the same result. As you learn you'll find which ones are best for certain situations.
