If you want understand how all this photogrammetry/3Dscan tools work and why all of this requirements for good scans is exists, I think you should read about underpaying technology and algorithms.
This knowledge give you some idea what you should do, what you can and sometime which well known advices is wrong.
If you mathematic you can find detailed explanation and formulas, but if you artists or technical artist on most readings you can see and compare some examples. And still have chance to understand what and how this work.
So, let's collect in this thread good or must-read articles or books.
For research papers and articles you can use Google for find PDFs, "paid account on parasite resources like IEEE" or great scihub.org.
If you'll download from scihub, don't forget drink some wine (or juice) in memory of Aaron Shwartz.