The objectives of tuning are transcendental. If you do nothing to hardware, then you just play with spark timing and fuel tables to reach ~14:1 AFR and complete burn. The real issue with learning tuning (besides the part where you need access to a dynomometer) is that you need to tune hardware as well to fit your application.
Look up "Exhaust theory" to get an idea. If you want to read about turbo fun-stuff, there's tons of info on https://turbobygarrett.com
, even if they are trying to sell you a product.
I got a new shell, just need to stop driving the DX so I can work on it.
I've got a filter for my mouth, it just isn't a good one.