Collecting Seed

Hi folks,
I just love my Shirley Poppy bed.  Dave's Garden website says:
"Bag seedheads to capture ripening seed
Allow pods to dry on plant; break open to collect seeds
Properly cleaned, seed can be successfully stored"

Can anyone expand upon this for me?  How do I go about "bagging?"  How do I
know when the pod is dry?  What does "properly cleaned" mean?  

Thanks for any help,
Kelly Stephens

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