One thing you should know though, is that A+ deals with quite a good bit of obsolete technology, so be prepared to learn about things like SIMMs and what kind of procs fit into Slot 1
simm - single inline memory module
slot - SEC and SEP Single Edge Cartridge and Single Edge Processor sep didnt have covers sec did and it was a cartridge
Celeron ( P2 and P3 based)
Pentium 2 and 3 (3 was later moved to socket 370)
rimms also (short lived in Intel machines (P4))
anyways yeah there is a bunch or rubbsih about dipps, sipps, 8086-486, AT form factor, hard drive geometry, pc bus, MCA bus, EISA bus, VL-Bus, Baby AT, riser cards, p8 and p9 connector, FLOPPY DISKS (THE RARE 8 inch, 5 1/4, and 3 1/2), 2-d graphics cards, SCSI-1, PDA's coaxial internet, etc.
but a lot of old computers (pentium 1 on) still exist and still use those eame parts you'll see simms in your line of work but unless your servicing a 286 your nto gonna see dipps