For side glass, either swat close to the glass without touching or hit into the glass; for back glass after a lob, consider moving back for a Bandeja, scooping a lob off the glass, or hitting back against your own glass.
This is very helpful if you struggle with balls that get stuck close to the glass. Sandy covers the key situations where this happens near the side glass and the back glass. He provides several options for how to handle these tricky shots. Understanding these options can help you avoid losing the point from a difficult defensive position.