Well, the good news about the mode dial is only 4 settings are worth learning about.
P: program mode, fully automatic. Nikon now says “P” stands for professional. That’s a stretch.
A: Aperture priority
S: Shutter priority
M: Manual mode
The rest of the modes are all gimmicks thought up by some marketing team.
About 99% of the photos I’ve ever taken were in A or M.
Edit: I like how Ken Rockwell put it, even if he often grates on me…
I use the P (Professional) mode. Only rarely do I use the S, A and M Modes, and I never use any of the others.
I ignore the green AUTO and all the other fluff modes. They are fluff and will not be discussed here. The fluff modes are for people not willing to read this guide as you are.