Want to get into tuning my motorcycles ECU. What are some good places to start?

I recently bought a 2026 Kawasaki ZX-4R as my first street bike, but also as a pet project. Something I could learn to street ride and race with, but also learn how to maintain, modify, and work on bikes in general. I want to under take flashing and tuning my ECU myself, because I believe that would be something valuable to know, and learning how to do it seems interesting. What are some good places to start? Specifically:

-What scanning tools/diagnostic tools/ tuners do you guys recommend? -What softwares are good to use? -What are some good resources I can use to learn how to do all of the necessary tuning (websites, articles, books, etc)?

I understand that shipping my ECU out to a tuner is an option. However, that is something I'd rather not do because it defeats part of the purpose of me buying this bike in the first place. It's just a very deep and complex rabbit hole for me, and sifting through all of the information as someone who is new to this can a lot. I just was hoping somebody could point me in the right direction to start my search. Any information would be greatly appreciated!