Well there are many many tutorials but you need to pick ones that fit your level of knowledge PLUS ability to pick things up.Is it just trail and error or is their tutorials and help online ie YouTube
From my perspective I have used hundreds if not thousands of programs and rarely use a manual (although you tube helps with that.)
But it's like no other I have used.
I think I might have been given a gem.
I was told to think of fusion as you need to access a function.....then carry out the tasks you need . Then close the function.
With most other programs you can jump around between menus and they all tend to be similar and intuitive.
Problem I find with fusion is I need to carry out a function but its hard to find a tutorial that covers just that aspect. They very quickly expand into a lot of stuff I don't need and cant remember so my brain overloads and I get frustrated.
Another key is learn to sketch first before bothering to work in 3D......
Hope this helps.