Hi stowell5005
The term proof refers to the process used to make the coin. Specially prepared dies and polished planchets are used. (A planchet is just a term for the metal disc from which the coin is struck. Proof coins are usually struck at higher pressure and slower speed than business strike coins. This results in coins that have a deeper, more defined image than normal.
Cameo refers to the contrast between various parts of the coin. Almost all modern proof coins have a frosted image and lettering and a mirror-like field. The process makes the coin look like a cameo brooch, so they're refered to as "cameo".
"Deep cameo" (DCAM) just means an even stronger contrast.
There's no need to feel dumb, every collector starts at the beginning and works from there. With all the coins available it can be overwhelming though, take your time and enjoy yourself as you learn.
You'll find that most coin collectors enjoy sharing their hobby, so don't be afraid to ask questions. The only "stupid" question is the one that you don't ask. Hope this helps