Another method is to pour the seeds onto a sheet spread in front of a fan. The heavier, best quality seeds will fall onto one area of the sheet. Remember to keep the seeds dry and exposed to the air at all times until they're ready to store. Mould will quickly kill them. The top of the refrigerator is a warm, dry place in most homes.
Baskets enable air to circulate all around the seeds.
Small plates or bowls are useful for the small seeds that are not suitable for baskets. When the seeds are thoroughly dry they can be stored. Larger seeds are ready when they will break rather than bend. I sometimes use the bite test for beans and peas. When they are too hard to be bitten they're ready.