It is on the little sheet the pharmacist gives you with each of your meds. Lots of usable google keywords to harvest there.
Put simply, it is a potassium sparing diuretic. What that means is you pee a lot, but your kidneys will avoid passing as much potassium from your blood to the urine as would naturally occur. It is also an anti-androgen and will decrease T over time by an amount unique to each individual; you'll know when you get your next blood test, or you might know it may have dropped below fem-normal when you no longer have spontaneous/morning erections.
The only serious, active trick to me seems to be being mindful of potassium and sodium in your diet, vs sweat, vs urine excretion. What will work for me, won't work for you, etc, unless we have the same exercise and hydration patterns.
A sign to watch for would be cramping, which occurs easily when the two get out of proportion. If you start to cramp don't drink gatorade, tomato juice, v8, or blood orange (which have substantial potassium), drink plain water and eat a little something salty and easily soluble.
If you feel faint, dizzy, or grey out when you stand, you just need more water mostly and a tiny bit of food. My BP dropped to 90/50 standing up, when I was out working earlier this summer in the heat. Blackout, face plant, chew dirt, very amusing for bystanders. drink plenty if you are exercising.