100% of 3 Pros
Indeed or LinkedIn are good places to search the latest job postings
100% of 1 Pros
Indeed is a great place to look for job postings. You can also try working with temp agencies in your area to help find a position that you would be interested in. Tasker is also a great app that you can use to create your own schedule, choose your own rates, and select tasks that you are willing to do and get hired by the public through the app.
Some of the fastest part-time jobs to acquire are in fast-food and retail, but if you have time during the summer, I'd recommend summer camp working for a couple of reasons. First, it gives you a fun adventures to go on during the summer. Second, you will likely receive certifications for lifeguarding and/or ropes course work that you can use outside of the summer for part time work as your schedule shifts around. Third, you have a great opportunity to get to know the other workers well as you'll be spending most of your time with one another. If you're looking to be successful, any kind of networking will be helpful for you.
Job search websites like Indeed and Monster are great places to start looking for available opportunities! If you have a LinkedIn account, you can also use its job search feature or reach out to your connections to inquire about open positions.