Hot Peppers are great companion plants to a lot of other plants, especially in areas of your garden where you have trouble with root rot and Fusarium diseases. The hot pepper's root helps to get rid of those types of problems. But for plants that help the hot pepper, you need to look at plants like the tomato, green pepper, and okra. These types of plants help to shade your hot peppers, keeping them from drying out and helping keep some humidity for them. Many hot peppers will need to be planted together also as they fare better while growing.
Plants to avoid planting near your hot peppers: beans, broccoli, brussels sprouts, caulifllower, cabbage, and/or fennel.
Remember when harvesting and preparing hot peppers to wear gardening gloves or other protective gloves, as some peppers are hot enough to burn your skin, and you also do not want to wipe near your eyes with the juice and oils from the peppers on your hands.