For best cropping, grow sweet peppers and chilli peppers under cover in greenhouses or similar, as they like it warm and sunny.
Grow in a good multi-purpose compost and feed weekly with tomato feeds, seaweed extract or homemade comfrey mix once flowers appear.
Peppers need very little care, despite needing a long growing period before they are ready for harvesting.
Sweet peppers like a humid atmosphere. Keep well watered and also consider watering the ground around them on warm, sunny days. If you get a heavy crop be prepared to add support canes to prevent the plant from collapsing!
To get hotter chilli peppers you can try stressing the plant. Methods can include allowing the soil to temporarily dry out, or to stop feeding. Bear in mind this is likely to reduce the overall harvest.