Part-time jobs that fit around childcare - any advice?

A grocery chain and a hotel near Fresno are hiring part-time staff. This is my first time dealing with any of this. They can give a schedule two weeks ahead. How many hours do they guarantee?

I worked evenings at a hotel. The hours were steady and the team was friendly, but weekends were busy.

Ask whether the schedule is posted in advance and how they handle swaps. It matters a lot with kids.