I fix consumer (OEM/SI and custom builds) PCs and am training some co-workers that are currently less experienced in building. The big thing I would like to have around for everyone’s benefit is simple charts for things like screws/mounts. With the sizes/dimensions/names, especially the specific technical names. That would make it easy to buy extras instead of just typing “standoffs” and getting all the sizes presented that aren’t correct. Nothing is more frustrating than having all the parts, but not screws/standoffs/mounts/etc if there is an issue (sucks if a motherboard has an NVMe slot but the standoff and screw wasn’t provided or lost).
That all being said, I would love to get whatever other folks have around for part charts. It is always nice to be able to show various examples of different parts that can help show differences if a physical item isn’t around to demo. An easy example is showing how the different DDR generations have the notch in different places. Or Ethernet cable wire layout for re-heading a cable.
I’ve encountered no fewer than 3 different thread sizes rank for motherboard and M.2 standoffs, so i would start with a thread gauge, as small as possible, that at least includes M3, M4, #6-32, and #4-40 since those are the most common ones in my experience