If you are interested in off-road driving, then one of the best ways to learn about it is by interacting and networking with other off-road drivers. The ones you should interact with are the ones who have the most experience. For one thing, they are the most comfortable and able to share some tips.
One place you can go to for information on off-roading is the local off-road shop. One of the advantages you get at the off-road shop is that there are off-road driver events that are often hosted. They will give you a lot of information and even examples on off-road driving.
You can also go to manufacturers for information. You can get information on how you can optimize your vehicle for off-road driving. There are also vehicles that are designed specifically for off-road travels so that you do not have to go through all of the trouble of making modifications to your vehicle.