You need to understand the importance of your diving equipment. Your equipment is your lifeline while you are underwater. Always keep this in mind to avoid any untoward incidents in the future.
That said, it should be part of your routine to always do a quick check-up on your diving equipment before actually going underwater. You need to look for any faulty equipment warning signs as these may cause serious trouble for you. In particular, watch out for strange smelling air, leaks, and broken buckles to name a few.