I want to try harvesting my own seed from the plants in my garden and the product I have gotten from farmer's markets. Just wondering if anyone has any advice!
It sometimes depends on what you're harvesting. If it is tomatoes we've found it best to ferment them before bagging. Most things we collect the seeds and set them somewhere they can dry out nicely and evenly (on a dish, not in direct sunlight) then place them in something like either a brown bag or a glass jar to further dry out. Finally, when we're really certain they're nice and dry, we bag them up in a small ziploc bag & label and date them.
Know though that some plants (heirlooms especially) are open-air pollinated - so unless you grow them yourself they may have cross pollinated (we've had this happen with tomatoes and an acorn squash/pumpkin hybrid) - and dill & fennel are REALLY well known for doing this if planted too close together. Also, make sure you know which plants might be biennial so you won't be disappointed if they don't come back the next year. Collecting seeds gets so addictive though and is SO much fun. Good luck!!