Do organic gardening products such as pesticides, fertilizers have to be certified?

I’m starting an organic tomato garden and with so many different options, I wanted to make sure that I’m only using products that are in fact organic. I understand that only food and fiber require certification, but what about gardening products?

Organic gardening?

What are some things I can do to keep my plants from getting diseases, I don’t want to use any chemicals? And how do I keep vegetable eating insects out of my garden? I know there are some insects I can put in to eat the others, what can I plant to attract them?