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It is just like giving them a haircut. Just trim them straight across the plant about 1/3-1/2 way down the stems. They will regrow new leaves from the base of the plant.

Trimming cilantro is just like giving it a haircut. Cut straight across the stems about 1/3 - 1/2 the way down the plant. New leaves will grow from the base of the plant.

You can start to harvest cilantro as soon as you have a few stems on the plant, though this is not likely to be enough to make a dish with. So, you can wait to harvest until you feel there is enough to cook with. Don't wait too long or be too shy about harvesting. Harvesting can help keep bolting from occurring, which ruins the flavor of the plant.

Wait for the plants flowers to die and dry out some, then cut the flowers off. Place them in a paper bag and allow them to dry out the rest of the way. Then gently shake the paper bag and this will loosen the seeds from the flowerheads and you can separate them out.

This article will help with growing cilantro herb plants: https://www.gardeningknowhow.com/edible/herbs/cilantro/tips-for-growing-cilantro.htm

To help make them bushier, this article will help: https://www.gardeningknowhow.com/edible/herbs/hgen/making-herbs-bigger-through-pinching-and-harvesting.htm

This article should help: https://www.gardeningknowhow.com/edible/herbs/cilantro/cilantro-bolting.htm