The technique to maintain distinctive breeds or even best of breeds for your area (largest fruit, most fruit, strongest grower, etc) is fairly straightforward for insect-pollinated plants.
Before the flower opens, enclose 2-3 buds in some kind of bags to protect them. I like organza bags which...
I'm not generally into hot peppers, so I don't grow them. I always get bell peppers when I buy peppers at the store, but bell plants just don't produce many fruits for me.
Anaheim has been my go-to in the garden. High productivity, medium heat and works in everything I want to put peppers...