How to eat healthy on a budget

Hey everyone this is a weird question but I don’t know how to eat healthy and I dont have much of a budget to work with. I’m married and my anxiety and ptsd is limiting what jobs I can do with out having a meltdown so right now I work full time watching kids making only about 400 a month until the state assistance thing kicks in and they start paying for the kids care. I’m married but my husband believes his money is his and mine is mine though at the moment he is paying the rent and phone bill on his own and I am paying my bills like my gym membership and car insurance until I start making what I’m supposed to. I am trying to eat healthy but he said it would be my job to get groceries since he isn’t home much and when he is he eats out. I didn’t grow up eating home cooked meals so I don’t know what to make that is good for you and can aide in losing weight. According to my BMI and my gym I am obese so I’m trying to drop weight and ttc. I would like to know if anyone has any recipes of things that can be made for cheap or cheap heathy snacks and things like that. Thank you