There are some things I'm obstinate about, and one is which mouse button selects. It really seemed to be change for change's sake for Blender's default to be right-click. And in node window, left-click to select doesn't work very reliably, so I have to right-click to drag nodes around. Whenever I install a new version of Blender, that's one of the first things I change: that, and I remove that animation thingie (Video Sequence Editor) window for which I have yet to find a purpose... perhaps when I do dynamic cloth in Blender, I might go there.

About background images in world: the only way I can even see that background image at all is when I have the render camera active [NUMPAD 0]: otherwise it's a blur of colour.  And I have no idea how - in those tutorials - those people manage to rotate that camera around the figure. As soon as I try to rotate with middle-mouse button, the camera automatically switches to some other and I can't see the background anymore. :sad:

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks