To be honest with you if you spent $900 on going out to eat and $400 on groceries in the last 60 days (2 months) then that averages out to be $650 month for going out to eat and for groceries. Which is not a bad average. I spent about $600 a month just on groceries for my house. But we rarely go out to eat.
If you want to cook more to save money that is fine. Groceries are always cheaper than restaurant food. But if you hate to cook and you haven't been much of a cook your whole life, trying to change now just might make you miserable.
I don't see how you got by with only spending $400 in 2 months on groceries. You must literally never eat at home. That's only $50 a week.
ETA: if you want to try and eat at home more, I am going to suggest you find the Stouffer's section of the freezer department at
Walmart. They have these boxes of frozen dinners you can buy, not tv dinners but bigger boxes of stuff like Enchiladas and Lasagna. You pop them in the oven and bake them for 70 minutes and you have dinner for less than $10.
They also have a section in the freezer part that are bags of pre-made mixtures like stir fry and you just add meat to it. Some of them actually even come with the meat.
I know stuff like that is easier than trying to make meals from scratch when you hate to cook.
Something else we make that is easy and quick is if you have a grill you can grill up some boneless skinless Chicken breasts and slice it up real thin and put it in tortillas with cheese and you have homemade Fajitas. DH also grills steak a lot and we just microwave some baked potatoes.
Having a gas grill makes cooking a lot easier. I also buy pre-made frozen hamburger patties and grill burgers at least twice a month.
Start buying the pre-cooked microwave Bacon that you just heat up in the microwave and that makes for a very fast breakfast, just scramble some eggs and microwave the Bacon for 40 seconds and in less than 5 minutes you have breakfast.
If you hate to cook, convenience food makes things a lot easier. You can even buy pre-cooked microwave pancakes. We buy those for DS.
You can cook more and still not have to invest a lot of time an effort into it.