Tammy:
At the top of this forum topic and others, are stickied threads. Have you read them? What didn't you understand? Perhaps I can help you understand them: I wrote several. It comes down to 3 steps:

1) Keep you pH in the good range.
2) Know how much stabilizer (CYA or Cyanuric Acid) you have in your pool, measured in PPM--Parts Per Million. If you have 1 liter of stabilizer and 1 million liters of water, you have 1 PPM. If you have 1 milli-liter of CYA and you have 1,000 liters you have 1 ppm--Part Per MILLION.
3) for your level of CYA, know how much chlorine you need to keep in your pool and keep it there. It's in Ben's Best Guess table.

You do that with a clean pool and it will stay clean all summer. That's all there is.