The very last version I used was 2.79 before 2.80 was released. I waited before I wanted the new fork to mature. Now that 2.91 is released, is this tutorial still relevant or 2.91 changed a lot?
The UI, notably the modifiers panels, are slightly different (applying modifiers is done from a drop-down or hotkey combo now) but otherwise this course is still perfectly valid.
No problems with the tutorial , and I have Blender 2.92. The basics are still the same with just some extra buttons to play with. But its all easy to follow with out looking up extra stuff.