Another note, a closed brain coral is easy to care for. You just have to keep it like...6 inches away from things that it might sting. Mushrooms are also a popular starter...but can outgrow tanks easily among other things.
As I said before, I started off with a kenya tree. Reproduces easy, could be to fast for some. All of the fast reproducers, like star polyp, kenya tree, etc. can be seen as weeds of the sea. If I can get mine to take off, I'm hoping I can trade frags to my lfs
for cooler corals.
The next one I get I want to be a Toadstool mushroom. Yet again another bland colored coral. You can easily frag this as well by cutting some of the top and anchoring it to the sand or LR
And lastly, a zoanthid. These guys have a HUGE variety of colors and given the right conditions, reproduce easily. Like the star polyp, it can overtake neighbors quickly. If you do like them, like I do, keep in mind that you can just cut them back with scissors. I already have a piece of LR
in mind for when I get to this step.
A christmas tree coral might also be an ok pick...but bland in color and can sting... all things you will run into often. This is where your research goes and what it is you are looking to do in your tank. I'm far from an expert, but I'll help out as I can.