Betta males are beautiful ... put a mirror up to the glass and he'll flutter his fins and show off. Not for fun, mind you, as it's preparation for a fight. They are also called Siamese Fighting Fish. Two males together will tear each other apart...and they aren't too kindly with other tropical fish either.
Years ago, when my kids were young, I bought a female and male betta and had a breeding cage in the tank. They mated, and father makes a bubble nest at the top of the cage. When ready, many times the father wraps his body around the female and squeezed the eggs out, then left her to catch the falling eggs in his mouth (hundreds of them) and deposited each one in a separate bubble at the top of the cage. After that, you have to separate them as mother will eat her eggs as they fall from the bubbles..and father might not be too happy over that as it's his job to raise the kids. when the kids leave their bubbles and start swimming on their own they leave the cage and go into the waiting hungry mouths of other fish in the tank. Quite a vicious cycle of life, but very interesting.
One thing for sure. They are live animals and deserve proper treatment which takes planning, time, effort and care. Don't get involved unless you're prepared for the task and studied it thoroughly beforehand.
Brian