Anything at all - even vegetable oil - is better than just letting it sit so long as it can get into the moving surfaces. So many people just ignore this stuff.

I'm going to incur some wrath here, but I'd say start with some WD-40 the first time (as a penetrating oil to loosen up the neglected parts) cycle the door a few times and actually jog it sideways a bit to get the roller stems free in their mounts, then follow with lubricant. After that just periodic lubricants will be fine.

Source: Experiments on a relative's nearly-rusted-solid garage door hardware in the northern midwest.

3000K - 4000K FTW depending on where you're using it. Work areas you might actually like the "harder" 4000K or more but for interior domestic areas the lower color temperature is best. Also don't be afraid to actually check out lit bulbs in a big-box store if you can...manufacturers will fudge their color temperatures sometimes though this becoming is less common. Source: Light nerd who's refitting his house away from fluorescents.

Here's a graphic guide

I seem to have a vast assortment of anchors for different applications (toggle-bolts/drywall "snap-skru"s/expansions/grip-fast etc. etc.). Do these Fischers really do all of them that well?

Wait until you find out about expansive soils: https://youtu.be/SW-NoiM726U

TL;DR some soils expand/contract with water content and can cause havoc. Get some long gutter spouts.

Not to mention hydraulic erosion and weathered talus slopes.