I don’t believe anyone truly has a black thumb since most of the time your green thumb is something that develops. For every skill, there are naturals and then there are people that train to be able to be good at that activity. The individual only knows the difference, from the outside looking in, you are just good.
As an avid plant collector, my favorite plants as an intro to plant parenthood are pothos and philodendron. These are both vine plants that will wilt when they are thirsty and will get yellowing leaves when they are overwatered. If they don’t get enough light they grow slowly. If they have been growing well and suddenly start to show signs of slowing down, they are in need of fertilizer and/or a new pot.
While Home Depot is the first place that comes to mind, I highly encourage visiting a local nursery for your first plant purchase. Plants are cared for tremendously better at nurseries than big box store. Nurseries also have a better variety to pick from.
Plants in a home dramatically upgrades the
atmosphere. Buy one and you will notice the difference.