Seed saving is very important, especially since the Big Ag / Big Food creeps are trying to own patents on all the seeds in the world by genetically modifying them. Diabolical!
These are seeds I saved from a Broccoli Raab plant that bolted in my garden last month. Bolting means sending up a flower stalk. For cold loving plants like Broccoli Raab, warmer temps signal them to bolt and set seeds for the next generation. It's a Darwinian thing.
It's easy to save seeds. You simply let your plants complete their life cycle when they're done producing food. Instead of yanking the spent plants out of your garden, let a few of your favorite ones set flowers, and then set seed pods. These small flowers will attract beneficial insects to your garden, which is a bonus of this process. Allow the seed pods to dry on the plant and then crunch them open. Inside are the seeds for next years crop. I put mine through a mesh strainer to strain away the bigger parts of the chaff.
Package them up, save some for your next years garden and share the rest. We win!!