It started with the idea of eating as cheaply as possible with nutrient dense foods, but I started off with an elimination diet.
I chose 2-3 "meals" that I could easily prep and only cost $2-4 each. Mostly eggs, ground beef, white rice, potatoes. I quickly added bell peppers and onions.
I tracked macros, and filled in the micros with new additions. Calories as well of course.
The result was fantastic.
1. I got really fast at cooking, and even now that I cook more complex meals, I'm much faster than before. Probably because I introduced new ingredients gradually and maintained efficiency in the kitchen.
2. My ability to eyeball macros on a plate is pretty good now. It's much easier to regulate my energy levels because of this. I can also guess my bodyweight within ~5lbs before checking the scale.
3. I figured out what I digest most easily. As an athlete, I can't really afford to have days where I'm "bathroom dependent".
The consistency in all these aspects has greatly improved my life.
If you want to get better at cooking, understand your body better, save time, and eat a healthier diet, this method might work well for you.
Disclaimer: after the first 2-3 weeks, I switched from 100% compliance to ~80% compliance. That way I get the benefits of regimented eating without going crazy. Even if you eat healthy, it's not good to obsess over calories and food options.