All are the same-all are different. I am saving seeds, learning as I go. Directions online say to ferment tomato seeds, then wash and clean them.... blah blah blah. So I did. Those annoying fruit gnats appeared and now they are everywhere. So I set the "fermenting" dish outside where it promptly got maggots.

I threw it away. Sigh. I think I'll try just drying some like my Daddy did.
Corn. easy. Get as dry as possible in the shuck, pull and shuck. Let dry, then shell. Put in a glass jar after VERY dry or it will mold.
My collard greens finally went to seed after 4 years. I got pruning loppers and chopped them all down but two and these bloomed and made seed pods. They got covered with gray aphids, absolutely covered. I just let them be. To have beneficial bugs, you gotta have bad bugs for them to eat. Sure enough, the ladybugs showed up, laid eggs, larve hatched out and they all had an aphid eating celebration. The seed pods dried and I picked them. I shelled them out and put the seeds in a saucer to further dry. I put them in an envelope.
I let a beet grow to a monsterous size and bloom. I saved the seed.....we'll see next season.
I have carrot blooms with tiny green seed pods in the garden now. Waiting for them to turn brown.
I have saved my green bean seeds for 5 years, give lots away and send them to my friends here on TEG.
I saved Voilet's Multicolored Butterbeans last year and planted them this year. They were in a envelope over the winter.
I am making progress and learning as I go.