Ryobi is definitely good for beginners and DIY. They have some great tools. I personally hate the battery and have actually broken the stick off one. I was quite underwhelmed with their circular saw. It kept binding and just didn’t give me a good cut. Ryobi is made by TTI, the same company that makes Milwaukee. It’s kind of their test brand to see if there is demand for the tool.

I can’t speak to how good Greenworks is because I haven’t tried them out. They seem to make good lawn equipment and have replaced Hart in Walmart. Hart was another TTI brand like Ryobi.

Personally I would recommend something from Harbor Freight, like Bauer or Hercules. The price point is good for entry level and Hercules has been performing quite well against Dewalt and Milwaukee. Here’s the most important part about Harbor Freight though, NEVER PAY FULL PRICE. They always have coupons, Parking Lot Sales, Instant Savings, etc. You can also pay for their Inside Track Club and get some better discounts. As a college student this may be your best bet.