Korean Squiers CN/VN: C = Cort, V = Saehan(Sunghan), S was already taken by Samick so Saehan(Sunghan) used V instead (Saehan(Sunghan) made the Vester guitars), N = Nineties (1990s), the first number following the serial number prefix is the year. For example "VN5" = made by Saehan(Sunghan) in 1995.KC/KV: KC (Korean Cort) and KV (Korean Saehan(Sunghan)), the serial number prefix is followed by a 2 number year. For example "KV97" = made by Saehan(Sunghan) in 1997.
We also have some other blog posts related to Fender that can hopefully be of some help.
There's A Brief History of the Stratocaster Part I and Part II that follows the evolution of the most popular Fender guitar of all.
Here is what the neck date and body date look like from a 1952 Telecaster: If you're not comfortable removing the neck of a guitar to peek at the date marker, I encourage you to take it to a local tech or luthier.
I will also mention briefly pot-codes as a resource (numbers on the internal potentiometers of the guitar).
For starters, there's the Reverb Price Guide which has thousands of entries with pictures and details on various guitars and other gear.