The better you take care of your brushes, the longer they will last you.
To condition a new brush, lay a thin viscosity gel on a palette or form backing and run the brush through it back and fourth until it starts to loosen up and is fully saturated with product. Remove excess product with a DRY lint-free wipe before storing somewhere away from direct sunlight or dust.
To clean your brushes, avoid using Prep & Clean or alcohol as they can dry out your bristles over time, making your brushes unruly and difficult to work with. Instead, work the bristles through a thin clear gel (I'm A Matte is a great option) until all of the unwanted colour/product comes out and when you wipe your brush (with a dry lint-free wipe) the wipe comes away clean.