It is important to know that not all vegetable varieties are suitable for seed saving. If the variety you want to save is a hybrid, seeds from that plant will not produce genetically true fruits. Most likely, the plant will produce a fruit that resembles one of the plants used to create that hybrid. To avoid this, choose heirloom varieties, ones that have been around since grandma’s time or earlier. […] Heirlooms will produce offspring that are identical to the parent.
Green peppers are unripe and so the seeds generally don’t grow into anything
also the second generation of plants are mostly way worse than the first (which produced the fruit that you buy)
I don’t get this statement. Like is there some ancient pepper plant that all seeds come from?
From PSU:
https://extension.psu.edu/saving-seeds-from-your-garden