The first step is putting a blob of shampoo on your hand.
Cleaning your make up brushes is essential and its recommended you do them weekly. If you don't regularly wash them it means your putting the same bacteria onto your face from previous weeks, which is a horrible thought. I would say if you use products like foundation and concealer, those brushes should be cleaned more frequently than eye brushes or brushes you use for powder, blusher etc.
Thank you for reading I hope you enjoyed! <3