I have:

Lithium grease (can)
White lithium grease (spray & tube)
Dielectric grease (tube)
Silicone (spray)
Dry lube (spray)
WD-40 (spray)
Tri-Flow "Superior Lubricant" PTFE (liquid)
Vaseline (jar)

So, optimally, which goes where?

I know, in general, but often wonder if I'm inadvertantly using the wrong product--for example, I have my front seat removed for deep cleaning, and figured I'd give the tracks/mechanism a good spray of white lithium grease... until (afterwards, of course) I realized how unprotected that region is, even with the plastic covers in place, and how quickly it will be covered in a mess of dirt and dog hair--which, actually, was why the sests were being cleaned in the first place, doh! So now I'm in the process of cleaning the white lithium grease *off* of the seat tracks (such a not-easy task, I don't recommend it) and contemplating how I will lube afterwards. Tending toward dry lube, but not sure it will provide the robust lubrication that mechanism needs.

Another example: recently was cleaning lock cylinders and lubed with the PTFE product--and then, in trying to remove excess, kept inserting/turning/removing/wiping key down, thinking eventually a clean, dry key would emerge, but no. Finally just reinstalled the ignition cylinder and resigned myself to distributing traces of PTFE everywhere my key goes after I drive. That doesn't seem optimal.

And another example: while cleaning door sensor switches (same happened with the locks), I was using Electronics Cleaner spray and that spray seemed to interact with whatever lube was in there and powderized it--which doesn't seem like a good thing to have in either a switch or lock. Was it the cold from the cleaner spray doing this, and does it turn all grease to powder?

So you see, I have questions. What advice can you offer? Thanks in advance.

My lay man explanation AFAIK.
For seat tracks just use Dry graphite spray lube. Also use for lock assembly. Doesn't attract dirt.

Lithium grease (can): Metal on metal parts door hinges, strut pins, bearings rollers.

White lithium grease (spray & tube) same as above but goopy and tracks dirt.

Dielectric grease (tube): electrical connectors not the contact pins because it's non conductive, little bit on the spark plug boots.

Silicone (spray): safely spray around rubber.squeaky rubber bushings. use on weather
stripping to keep them from drying, use it on mëtal door hinges or exposed metal as rust prevention.

Dry lube (spray).:Should dry as to not attract dirt. lube tracks, rollers, hinges.

WD-40 (spray) :water repellent, rust protector, grease, glue grime remover. Use on under carriage, exposed metal, expose bolt heads etc.

Tri-Flow "Superior Lubricant" PTFE (liquid) Water reppellent and adds a teflon coating to metal on metal parts to reduce friction. kind of like wd-40 with teflon.

Vaseline (jar)= use on battery terminals, good conductor but flamable. petroleum jelly, so bad for rubber

I'll add:

NLGI 1 for slip yokes spline shaft or NLGI 2 grease for the rest of the zerks.

Graphite dry lube for lock cylinders, good on metal on metal contact parts.

crc quick dry electrical connector cleaner.

Brake cleaner is a good fast drying grease and grime remover and cleaner bad for rubber and plastic but safe on paint. Really bad for powder coated wheels.