Again, I’m still a newbie to rifles so I just assumed they are called “sniper” rifles. I guess i’ve been watching too many movies...
As you are a newbie, please take a class or have an experienced person teach you firearms safety and the basics.
I've been around guns and hunting all my life but have just started into long range precision shooting. I have been reading "Long Range Shooting Handbook" by Ryan M. Cleckner and so far would highly recommend it. He goes into a lot of detail about ammunition and equipment before he even mentions the fundamentals.
But as I said learning firearm safety is the first step.