First, welcome back.
Where did you decide to go to college?
Put a thin coat of good grease on the bolt, the back of the lugs, and the raceways.
Use sparingly and work it all along the bolt to make a thin layer.
A little goes a very long way. Wipe off any excess, but seriously start off with a tiny dab on a finger.
This is the best for guns and well worth the price.http://brianenos.com/pages/slide-glide
This is a less costly, but still very good quality grease and works well too.https://lucasoil.com/products/grease/red-n-tacky-grease
Remove the firing pin assembly, and put a few drops of a gun oil on it.
Mobil 1 works well too and one bottle will be a lifetime supply.