I used our sterilizer twice maybe 3 times. When we first bought the bottles and when my son got super sick and we wanted sterilize everything. Other than that, we just had washed them.
you can boil them or dishwasher i personally just boiled as no need for sterilizer as I switched to mainly breast-feeding
You can use your dishwasher but I personally prefer using the sterilizer. I think it’s quicker and more convenient