I sold my computer and bought about 0.006 bitcoin.
For the rest of money, I saved them in my bank account.
I hope this decision is right.
If you sold something you don't need, that's good news for investing. If you're selling something you use and need, I'd say it's a bad decision. We all want to have capital to invest, and sometimes we can obtain this capital by selling items we do not use or need.
Increase your investment amount gradually and do not put yourself in a difficult situation. When you wait patiently, you will see that you will make a profit.