OP you will have got from this by now that you can definitely make some changes to be more economical.
As for not being able to cook, it’s really not difficult to learn how to make a few simple meals but I can tell from your responses you feel a bit overwhelmed and lacking in confidence. So I’m going to make a few suggestions that might help you, both with eating and cooking and will also help with budgeting.
Get yourself some freezer storage containers so you can do some simple batch cooking. Amazon do loads. If you are cooking for your child make sure to get some smaller ones to freeze small portions.
I would recommend a slow cooker if you can afford one.
Get an app or two for family friendly cooking. I like the baby led weaning app (great recipes for toddlers) and also the slow cook recipes app. The instructions are easy to follow and you can make lots of things you can freeze that you can then reheat with pasta, rice or potatoes.
I also used to use a website called my fussy eater a lot when the kids were little. Lots of easy pasta sauce recipes for example. A hand blender is helpful for this (Amazon is again your friend, you can get one for less than £20).
The baby led weaning one has a super easy bolognese recipe for the slow cooker where you just lob everything in and don’t need to cook anything in a pan first. (I still use this even though my kids are much older!).
If you can get your child into jacket potatoes and eggs you can make some super easy and cheap meals. Jacket potato with baked beans, cheese or bolognese is easy and relatively healthy for a toddler (and you!). Scrambled eggs are quick and easy either in a pan or the microwave and perfectly fine for a toddlers lunch or tea.
If you have enough room in the freezer I would always have peas, sweetcorn and fish fingers in. Get the best quality fish fingers you can afford and they really aren’t that bad.
I don’t buy frozen chips. I just cut whole potatoes into wedges and use an oil spray. 30 minutes in the oven and they’re done. Easy.
Wraps/tacos are popular in this house and require hardly any cooking. You can freeze any wraps you don’t use for next time (they freezer better rolled rather than flat). Wrap either a chicken breast or a fillet of white fish (I buy frozen hake usually) in foil and bake in the oven for about 20 minutes with a little oils. I then do chopped cucumber, tomato and avocado, could also do chopped pepper. I just use a little bit of mayo or hummus for the kids. They love it.
Hope that helps a little.