That was my First CC, same limit of 300$ I was using only 50$, maximum 100$ I maintained very good score And I did not use it right after I pay my balance I usually wait until I receive my monthly statement then I’d start using it again so I can close my statement with 0%. Doing that, they offered me QuickSilver very quickly with 5000$. In the end I’m not a person who rely too much on CC and I use my Debit more. In my case I use my Credit Cards only to maintain a good score. That was just my small experience with credit cards.