Requesting tips on learning Mapping

Alright, so I have the attention span of a baby goldfish.

Now that’s out of the way, if someone could point me in the direction of a guide, maybe expressively highlight key portions that will drastically help, I think I can find the strength to overcome this mental freight-train.

Also, If you have any personal thoughts on what assisted you in the past, please share. Any general tips for quality, share. Willingness to spend a few decades teaching me via Discord, do it.