Glenn’s three rules
When it comes to tuning, aim for a nice curve. Do your own research into what works and what doesn’t. Don’t go too mad. It still needs to be rideable.
Power is nothing without control. Pay attention to making the best of your suspension and brakes. And that remains as true for any bike as it does for big four-stroke singles.
Forums can be useful. The old XT Forum let me weigh up various opinions on a number of options for what I might do with my bike.