The two main reasons that glass cooktops crack are hot spots caused by burnt-on food and scratches from the wrong cooking implements or harsh cleaners.
5 ways you're destroying your glass stovetop - CNET
How to Remove Scratches from Glass Stove Tops
I broke my stove (like, REALLY broke it) - The Frugal Girl
Canning 101: Can You Safely Can on a Glass Top Stove? – Food in Jars
How To Clean A Flat Black Glass Stove Top (Quick + Easy) - Sip Bite Go
How To Remove Scratches From Induction Cooktop
أسباب انفجار زجاج البوتاجاز
5 Glass-top Stove Cleaning Tips
How to Clean a Glass Stovetop - This Old House