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There are a few things that can cause this. This article is on tomatoes, but peppers are closely related to tomatoes, so whatever is making it happen on your tomatoes, is also affecting you peppers:
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-leaves-curling.htm

It might be slugs or flea beetles. These articles will help:
https://www.gardeningknowhow.com/plant-problems/pests/facts-about-slugs-and-how-to-kill-garden-slugs.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/what-are-flea-beetles.htm

In terms of big peppers, the manure helps a lot, but if you can't find manure, try coffee grounds. Most coffee shops will save them for you.

These articles should help: https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm
https://www.gardeningknowhow.com/edible/vegetables/pepper/pepper-yellow-leaves.htm

If this is not an issue with pests, I would guess that it's due to a viral infection of some sort, like Verticillium or Curly-top.

They are likely underwatered. Increase water to the plants. If they are newly planted, they may need extra water just for a week or two until they are established and have grown roots that can find more water on their own.

There are several factors that could be the problem. Pinpointing the right one can be difficult. However, here are some things to try: Check your soil conditions and soil pH (which should be in the 6 to 6.5 range). Chances are this is a soil problem. How's your drainage? Is the soil staying too wet or too dry? Amending the soil with compost can help fix these issues. The addition of fertilizer may be helpful but will not solve the issue itself. Dig or poke around in the soil and check for signs of pests (such as grubs). Inspect the plants for pests as well. How much sun are your plants getting, etc.