Roger that! A beginner asked me the other day about buying a Glock as a first weapon. Even though I admire Glocks (I have three, with thousands of rounds and no FTFs yet), I advised against it until he has more experience. I suggested a Beretta (safety/decocker) or a Ruger (DA/decocker) instead.
I suggested he consider a Glock when he instinctively knows the best primary pistol safety is the gray organ between the ears.
If one is in the habit of removing one's finger from the trigger guard when one does not have a target (a good habit for any firearm), that is all one has to do to holster a Glock safely, since the act of removing one's finger from the trigger lowers it to half-cock. With a Beretta or Ruger, safely holstering the firearm after use requires that one also operate the manual decocker. Additionally, the Glock has an identical trigger pull on every shot; SA/DA pistols require much more practice to ensure that the first shot goes to the same point of aim as the rest.
The Glock's safety may be summed up in three sentences: