using a 6 way test strip for water purity??

so i bought a bottle of water testing strips that test:

pH
TOTAL ALKALINITY
BROMINE
TOTAL CHLORINE
FREE CHLORINE
STABILIZIER
TOTAL HARDNESS.

This is probably a stupid questions,..but I was wondering.....

Obviously pH needs to be in a good range, but which other ones do you really have to worry about. I'm sure you'd have to have all of them in a good range right? I was wondering because I know chlorine is used in pools and it kills everything so I was curious about that part... do I use it in my bubble bucket? Planning on running into town in a little bit to buy ups and downs for pH and wondering if I need to buy for other stuff too.