Flue

what is the best module to watch to tune fuel for OEM ECUs i have a 2012 camaro ss l99 i watched the couple of them but their more for standalone ECU

What tuning software are you using? Or are you trying to decide what to use?

The video modules in the Practical Reflash Tuning are all about using software to reflash an OEM ECU. If you've purchased the course, look at these modules:

https://www.hpacademy.com/dashboard/courses/practical-reflash-tuning/basic-tuning-fuel-delivery

https://www.hpacademy.com/dashboard/courses/practical-reflash-tuning/advanced-tuning-maf-rescaling

And of course, the worked examples for HP Tuners on the Holden, etc

If you are looking in the Webinars, then the following might be helpful:

https://www.hpacademy.com/previous-webinars/204-hp-tuners-maf-re-scaling-made-easy/

https://www.hpacademy.com/previous-webinars/optimising-full-power-fuel-delivery-gm-ls3-e38-pcm-hp-tuners/

https://www.hpacademy.com/previous-webinars/199-optimising-your-tune-using-short-and-long-term-fuel-trims-stft-ltft/