Betta fish, also known as Siamese fighting fish, are relatively easy to breed in captivity. Here are the basic steps for breeding betta fish:

1. Obtain a healthy male and female betta fish. It is best to buy fish from reputable breeders to ensure that they are in good condition.

2. Set up a breeding tank. The tank should be at least 2.5 gallons and have a divider to separate the male and female.

3. Condition the fish. Feed them a variety of high-quality foods and make sure the water is clean and at the appropriate temperature (around 78-80°F).

4. Introduce the male and female. Once the fish are ready to breed, remove the divider and let them interact.

5. Spawning will occur when the male begins building a bubble nest and the female is ready to spawn.

6. Once the eggs are fertilized, the male will place them in the nest. Remove the female from the tank to prevent her from eating the eggs.

7. After about 2-3 days, the eggs will hatch into fry. Once the fry are free-swimming, they can be fed infusoria or baby brine shrimp.

It's important to note that breeding betta fish requires a lot of attention and care, and it's important to research and understand the process beforehand to ensure the fish's health and survival.