Why do you think that there is something wrong with them?

This is the first time I have ever grown anything so I am a total newbie. There are so many diseases and things that I get paranoid and cannot tell if there is something wrong or if any of it is normal

I don't see anything wrong. Can you post a picture of the whole plant?

These are from various plants but the one most concerning is this plant: the coloring in the leaf with the light and dark green (I dont know if it is a deficiency or something else) it is on the lower leaves and ever so slowly moving up. The other picture is of the edges of some of the leaves up higher. The edges are curling under and some look a little deformed. This same plant has tiny tiny dark spots here and there on the tomatoes. They are smooth on the surface and only in the skin of the tomato. They have diatomaceous earth on them and no pesticides or fungicides have been used.

I have many more pictures if you would like to see more

IMPE, lower, older tomato leaves start to die off as the plants grow - especially in the longer vined varieties. The leaves do get to look pretty gnarly as they fade and die. I remove them once they get yellow/ brown and shriveled

I do see what appears to be a little bit of insect damage, but overall not enough to be concerning. Nothing's perfect, and if the majority of the plant is healthy and growing, a little bit of damage usually isn't an issue.

When you grow a vegetable garden, it is normal for pests and diseases to be attracted to plants over the Summer. Weather whether from heat to drought to deluges can cause problems. Old leaves will have scars. Tomato plants may look awful by the end of Summer. You can't have perfection, you just try to avoid the worst problems.