Which are some good and free online sources for learning Unity?

I want to make some small games with Unity bit i am having a hard time getting started.

I tried following a youtube tutorial, but i quickly got lost, as the Unity version was different and things weren't at the same place,...

I know the Unity website itself has offers some material and courses, but its not too easy to navigate (or i am just stupid).

So maybe someone was in a similiar position, trying to learn Unity with free online material and give some usefull links and tips.

Maybe i also made a mistake of googling courses for a specific genre/type of game (Tower Defense)?

In any case i highly appriciate all input on this topic.
Which are some good and free online sources for learning Unity?
Which are some good and free online sources for learning Unity?
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