Here are the standard oiling points on a Glock from the owners manual.
In addition, there's a ramp/cam inside the slide (visible at the upper left of the picture--back inside left side of the slide) that needs a drop of oil, or a tiny dab of light grease on the ramped surface. I don't know why Glock doesn't call this spot out for lube. The armorer's class finally began to address it recently, but it's not in the manual or armorer's manual yet.