There are a lot of reasons Canning jars crack. The most common ones are:
Temperature Shock: Placing hot food in cold jars, placing a hot jar directly in the freezer, or placing a cold jar in hot water can break your jars.
Old Jars: Using old jars can make them more susceptible to breakage. You can use Old Jars for DIY home decor projects.
Overstuffing: Filling glass jars with food up to the brim, not leaving space for it to expand when it freezes, can lead to breakage.
Overtightening jar lids: Jar lids should always be fingertip tight. Overtightening them can break your Mason jar.
High Pressure: High pressure or keeping the jars too close can cause them to crack.
Commercial jars: Using commercial food jars instead of Mason jars designed specifically for canning. Commercial jars are not made of high-quality glass suitable for canning.
According to Michigan State University Extension and NCHFP, canning jars can be used for about 10 years if handled properly.