/biz/ - Business & Finance

Hey /biz/,
I just acquired my first credit card through pic related like a good goy. I made the mistake of waiting until my early 20's to even bother trying to build my score, but I'm starting with something like a 570. The limit on my card is also about $300. That being said, I've read on several other sites that you normally shouldn't go above 30% of your credit limit if you intend to build your score, rather than making a negative impact on it.
Can anyone advise me on how I can go about building my score as efficiently as possible (hopefully in about a year) without falling prey to any tricks or the trap of crippling debt?