how do you save seeds from veg like peppers to plant next year?

I dry them on a paper towel with good air circulation on them for about one week, then put them in an empty prescription medicine container, and store them in a tupperware container in the frig. They will be viable for next year. Heat and moisture will destroy your seeds. Do not microwave, or put in an oven or dehydrator. The other thing is, you likely won't get an identical pepper like the seed you got it from, since they are usually crossbred. The mold was due to the seed that was not dried out well. Putting the seeds in the sun should not harm them unless it gets over 100F degrees. I keep my seeds in the frig for years. They normally sprout right out with about a 10% decline per year of viability. May you succeed with your project.

Most of the vegetables that are grown now are hybrids, which means the seeds you get out of the fruit or vegetable will not necessarily grow into the same thing that you originally had. For this reason, you may not want to bother trying to save them. You can do it for fun, just to see what you get, but if you for sure want the exact same type of pepper, go buy new seed. If you want to save seeds, air dry them on paper towels, then store them in a paper envelope. Be sure to wash and clean the seed first.

Easy. Leave whatever you want to save on the plant until it's dried up and crisp. Take it off and crumble it. The seeds will be as dry as needed. Put them into an envelope and store them in a cool place.

If you're talking about a supermarket vegetable, it won't work. 2 reasons. One is that almost all veggies in stores are hybrids, and may not reproduce true.

The second reason is that the fruit is picked before it's mature, making the seeds immature.

It's quite easy, but you need to MAKE SURE they stay dry - dry - dry.... To begin with, you can throw them on a cookie sheet (not sure what those might be called in your area - but just a baking sheet you put in the oven to cook cookies!!)

But ONLY put the oven on bake with 105 degree temp (anywhere between 100-150 but keep the door of the oven open) since we really don't want to bake them! - just dry them out. Dried seeds (not baked) will be able to sprout many generations later (literally!!!!)

Once you have them dried out (just an hour or so in the 105 - 115 degree oven (or 45 min with the door open at MAXIMUM 150 degrees), throw them into a Ziploc baggie (again, not sure what country you are from, but an "air-tight" plastic bag) and they will last for years.

The dryness will not hurt them (again, DO NOT BAKE at high temp!!), and they will be happy to sprout again next year. Yay!