Side job is good as long as you have still time to do your responsibilities and other things.
It is a side job and you are in charge so you will definitely be able to create the time for other engagements unlike working under someone who dictates your time. I will choose multiple side jobs over working a job or business provided the side job is profitable. I will even agree to have a reduction in pay if I already work a job so that I could have time to run my business or do my side Hustle. For future sake, I think the side hustle or business you do for yourself is more important than the Job you are working for someone else.
Side jobs have their own boss, who is your client, but you can manage your time and choose when you are available your are still working for someone else. Also, there are specific side jobs, such as remote jobs, that require you to render for 4 hours at a specific time, but it is still considered part time. However, side jobs are not guaranteed work when compared to having a job because, first, if it is project-based, it will be gone once it is completed, and second, you can be fired or not hired anymore because there are no contracts of service on it, which means there is no assurance, unlike an 8-5 job where you have a contract. A side hustle is just an addition to our earnings, but it is not guaranteed.