Guys looking for a good advice i live in usa and already work with cars (gasoline and diesel)and i want to learn this more as a hobby, so my question is i own 2006 gmc sierra and would like to know what software and hardware do i need to start learning how to tune this truck. thanks! :D

I don't think you can tune stock gm's ecu's you would have to either piggyback, or just swap the ecu out for a nice aftermarket one.