Part-time jobs that fit around childcare

I am looking for part-time work that fits around school hours and found a few evening shifts near Fresno. This is my first time dealing with any of this. Shifts are four to six hours and the pay is weekly. Is the schedule really fixed?

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

Check how they treat part-time staff for benefits. Some add them after a set number of hours.