Green Thumb?

I have never really been good at keep plants alive, but over the past couple of years I have been given a couple of plants that I have some how kept alive. I don't have a green thumb, but thankfully my husband has sister's who know something about this. I was told not to over water the plants that I have and to make sure that they get plenty of sun. They both are in the sun all the time, and get water every few days. It seems to be working so far, but I wish I knew even more about plants and flowers. They add so much to a home, and if I knew more about how to take care of them, I would have more around.