Use it for rendering but I recommend you to buy a good system (New or used doesn’t much matter) ASAP if you want to take this thing seriously and make a career in it. Collect a few bucks by working for someone, it’s worth working for your passion. And be consistent, son. Never give up, there’s always a solution to every problem. Happy learning.
You can use VPS as well, a free VPS might waste your time.
Here’s another one,