wat is kh and ppm?

[sunnymau]

im a biginer and read about the relationship of kh,ph and ppm.hower i don understand wat r them and how to get the right relationship?wat are the things tat they will contribute to the tank? can anyone explain to me?
thx a lot.[:]

[Simon]

Please read this

for relationship, go to thekrib.com or do a search here