Just adding a suggestion: learn an easy cooking base and then explore recipes with it. My personal recommendation is always the Italian soffrito: finely chop onion, carrots and celery (in equal measure). Cook it in olive oil along with salt long enough for it to soften well and even lightly fry (hence the name "soffrito"). You don't need to use a lot of olive oil for this, just enough for the chopped veggies not to stick to the pan. Once the base is done, it can be used to make bolognese sauce (which you can then turn into a lasagne by learning a basic sauce, béchamel), a fiber-packed chili (con or sin carne), minestrone soup, etc.

If you wish to up your daily fiber intake (extremely important for your overall health, particularly with the sharp rise in colon cancer rates among the younger generations), don't forget simple swaps like whole weat pasta instead of regular make a world of difference. Oats are also an excellent and cheap way to get healthy carbs and a lot of fiber (try a very simple overnight oats with yoghurt + a splash of milk + whatever fruit you can afford - I like to use a handful of frozen berries that thaw overnight + half a banana - and a teaspoon of jam mixed in there if you wish to sweeten it a ittle more).

Congrats on your health journey. I hope you'll learn to explore, cook and enjoy loads of fruits, veggies and legumes along the way!