What am I doing wrong? Gardening

I have tried gardening for the last 5 years and has been unsuccessful, i tried new spot this summer and everything looks amazing tomato plants are huge and lots of blooms, butternut squash has lots of blooms and several small squash but the
blooms on tomatoes are not doing anything and the squash grow about an inch then they start rotting. I don't know what I am doing wrong and also some leafs on both plants are turning yellow. Please Help

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