[rednab]

Like many others, I heartily recommend the Donut tutorial as a start. It'll teach you the basics, get a handle on the most used shortcuts, and a feel for how the modifier keys (shift, alt, ctrl) work with the mouse. I also recommend that you print out a shortcut cheat sheet ¹).

That's just Blender, though. Learning modeling at least partly depends on what you want to model. Are you wanting to make models for 3D printing, for offline rendering/animated movies, or for real-time animation (aka games)? Do you want to make hard-surface objects, characters, landscapes? Are you purely interested in polygonal modeling, or also sculpting workflows?

If you don't already have some sort of a goal in mind, I would recommend you pick one. It'll make it much easier for you to work towards and if you share it, people might be able to recommend much more targeted courses.

¹) https://www.google.com/search?q=blender+shortcut+cheat+sheet...

[weinzierl]

Hard-surface is what I know and what I'll stick with for a start. Maybe later I will look into sculpting, which I find super fascinating but also a bit scary.