What is Reddit's opinion of 100 Side Hustles: Unexpected Ideas for Making Extra Money Without Quitting Your Day Job?
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As someone in a similar position, I found 100 Side Hustles by Chris Guillebeau to be a good read. No direct answers, but it has a bunch of stories of people who started small businesses while currently employed and not needing to take out huge loans. You probably won't find exactly what you're looking for but I found it to be good for brainstorming what kind of business I want to start.

Are you sure you have no other skills? Give some thought to all the stuff you do other than your job. For instance, if you can cook at even a barely competent level, a few good recipes can make you side money from baking.

Here's a list of 48 side hustle ideas on Chris Guillebeau's website (my favorite is "Get ordained online and earn $300 per wedding"), and he has a book called 100 Side Hustles and a daily podcast devoted to side hustle ideas.

Apologies that 2 of these 4 suggestions touch on HR, but I think you'll see you can use those skills to do something that's not quite HR, and can make you some good money.

Offer tutoring to other students at your college.
Commercial writing is a good gig for someone who already has business skills and has some writing structure. Peter Bowerman has a new edition of The Well-Fed Writer: Financial Self-Sufficiency as a Commercial Freelancer in Six Months or Less out for $19.95 in paperback and $9.95 on Kindle. That book changed my life. Another good source of info is Ed Gandia's podcast, High Income Business Writing. He has a "how I did it" episode about how he worked it as a side hustle while working full time, niches you might be able to get into, and a lot of other useful stuff. Case studies are a good niche to go after in a side hustle, they are simple to write and tend to be short projects.
Specifically, what if you targeted people who need help with their LinkedIn profile or need a business plan written?
Does your HRIS work involve writing code or anything like it? As long as the platforms you're using aren't specific to HRIS, you can definitely find some coding/development work on the side. Heck, my company is looking for a web developer right now.

Sounds like a 'side hustle', which is great! Perhaps you should check out this newly released book, "100 Side Hustles": https://www.amazon.com/100-Side-Hustles-Unexpected-Quitting-ebook/dp/B07H752CPH

If you don't mind, could you share a link to either of your online portfolios? I, too, am a front-end designer, and would be happy to share other advice, critique, or struggles.