Just a pre-heads-up: depending on what you're trying to do, the exact tool and thus tutorial you need maybe slightly different.

For example, I made a gasket for my mini PC awhile ago using FreeCAD. Designing it was a hell until I discovered the Sheet Metal Workbench in the plugin manager, and just like that, I got it designed & manufactured within ~4 days.

During my experience, most of my time was spent on learning how to use the Sheet Metal Workbench as well as how it interacts with other FreeCAD builtin features. FreeCAD itself is not that hard to learn.

Also, there are Piping Workbench too if you want to work on pipes, Wood Work Workbench if you want to do wood work etc, see: https://github.com/FreeCAD/FreeCAD-addons. Use the correct workbench for the right job will save you a lot of time.