First time vegetable gardener and I'm struggling!

My seedlings (from seed) all died before making it in ground so I purchased Bonnie plants from Wal-Mart and they aren't doing so great either!

Is this a hardening off issue (which I assumed was done before I purchased them) or a disease (septoria?) Or just too much water? It has rained here in NC for over a week

Any ideas or advice?

PS I fertilize every other week with Alaska fish fertilizer