A short answer:
(0) get at least two 27" monitors attached to your computer :-/
(1) you must get yourself some 3D MODELS. you can find many free ones on the internet, or, buy them (for a few dollars each) from a prop shop. Aim to get say ten models of common objects - table, balls, car, small house, whatever. Don’t worry about hinges, animations or anything like that for now (it will come…)
(2) learn how to generally begin projects in Unity, and how to import your models. at this stage things like “textures” and so on will be a bit of a mystery but don’t worry, just press on.
(3) learn how to move objects around in the editor, how to rotate objects and so on (keyboard “W” “E”) and indeed, how to move yourself around in the editor, spin your camera view, figure out about the camera view, and so on. select objects from the list, click “F” to centre them on the screen, add objects and delete objects from your scene. add primitive objects (unit cubes, etc) built-in to unity, and so on. explore properties in inspector.
(4) next, generally learn about colliders and rigidbodies. get a ball bouncing, create a “ground” with a large flat collider, make things fall on to each other. have fun. learn how to add colliders to objects, the different types of colliders, how to size them. Go crazy with colliders.
(5) now you have to annoyingly learn about scenes, and the gui - which are simple but you have to figure it all out. make different scenes, swap between them and so on…
(6) … and the GUI … get a basic grasp of the trivial unityGUI interface (just search down to ‘interface’ on the big manual page), so that you can put a simple button on the screen to allow you to change scenes. you can’t really proceed until you can do this.
(6) finally you must learn generally how scripts work. learn how to make simple scripts, where the files are stored, how to attach them, how to set and change variables, and so on. try adding existing scripts to your objects, cameras, try editing scripts, understand errors and so on.
This is the SEVEN POINT PLAN to get started!
Until you absorb these seven stages, you can’t “really begin” learning and working on tutorials, etc. I don’t know where you are based on the tutorials you mention, but you need to sit down and “do” - watching tutorials won’t help! Once you graduate from the seven stages above - I’d start making a simple 3D game. It’s the way to aggressively learn. Hope it helps you or someone!