Rifle Scopes MOA vs Mil

Suppose i should learn more about range finders. I had been led to believe that there is a high chance of inaccuracy because of the laser. Im not a veteran to the long range world so im just grasping some things and coming to terms with the fact that a good deal of what i "knew" about shooting is wrong and fairly useless in this world. Just trying my best to be better than yesterday. Wish i could find someone to mentor me but ill have to settle with the internet for now
There are guys all over this county on here, you should be able to find one close that can help you out.