When buying a new or used electric guitar, you should know some basic facts about them. The electric guitar differs mostly by their bodies, the wood tones,
The Hollow body electric guitar has a hollow body. It is pretty much an acoustic guitar but with pickups. This type of electric guitar produces acoustic output but it is also able to be played using an amplifier. The hollow body electric guitar is for the musician who wants to play quieter music like jazz and pop.
The Solid body electric guitars have a solid piece of wood and sometimes it could be a combination of pieces of wood. The solid body guitar is the most popular electric guitars on the market.

Lastly there is the Semi hollow body electric guitar. This type of guitar offers an acoustic output and uses electronics. Wood is placed under its top to help reduce feedback. It allows the guitar to be played at a higher level than the hollow body, but less loudly from the solid body.
Things you should consider when buying either a new or used electric guitar.
Be sure to check the wood. Doing this you will be able to determine which tone the wood offers. If it plays a warm tone then most likely it is made of Mahogany. If it makes higher tone, then it is most likely made from maple.
Hollow body guitars typically are made from maple or spruce. As for hollow body electric guitars, the more expensive models are constructed of solid spruce tops with solid maple backs and sides.
You should also count electric guitar strings. Listen to the electronics. Almost all electric guitars will have two or three pickups. If it does not, then something could be wrong with the guitar.