Welcome! This will be a lot easier than the fish tank. Read over Pool School, and you might want to take notes or print out parts of that also. It won't take too long before it all starts to link together and make sense. I learned that maintaining fish was really about maintaining the water, and it is the same with the swimming pool. You learn about what the tap water has, then what the pool needs, and use only the chemicals you need to get there.
I suggest you start a Pool Log with all the details of the pool; size, equipment and so on. Then get a proper test kit. I have the TF-100, as do a lot of the people on this forum. As you read Pool School, note in the Test Kits section the very short list of appropriate test kits. Get one of those. Then begin noting the results of each pool test. You will use the Pool Calculator to determine what your pool needs. The Pool Calculator will be your very best friend, so get to know it.
In a few short weeks, you will have a pool so clean and clear that you will become a pool snob, unable to get into any pool that is not Sparkling like yours is. Taking care of the pool is not hard, does not take long, and is not expensive. You're gonna love it!