Barbs come in many varieties are very hardy compared to many other fish. They also get quite large and add that extra fun to any aquarium.
Gouramis are higher maintenance and require a healthier aquarium to survive, but they add colour excitement because of their ability to shoot water.
Bettas are a excellent choice for beginners, as you only need one and don't need a large tank.
Half-beaks can be rather aggressive and are much larger fish than many others, but still remain a favourite among fish enthusiasts.