Bricking' your phone essentially means that your once useful device is now only as useful as a brick. A 'bricked phone' is usually unresponsive, won't power on, and doesn't function normally.

The steps for how to unbrick a phone depend on how it's bricked in the first place. There are two categories of bricked phones:
The soft brick. The phone freezes on the Android boot screen, gets stuck in a boot loop, or just goes straight to recovery. So long as something happens when you press the power button, it's soft bricked. The good news is these are pretty easy to fix.
The hard brick. You push the power button, and nothing happens. Hard bricks can be caused by issues like attempting to flash an incompatible ROM or kernel, and there's normally no software solution for them. Hard bricks are terrible news, but fortunately, they're quite rare.