Ride more and it will come to you. I started riding with groups that were no drop and followed them to see how they handled it. Mainly what I learned was picking your line is the most important thing. Choose which rocks and ruts you want to cross don't let them be random. Second was relaxing on the bike. If you let the bike do its job it will carry you through most obstacles but if you have a death grip on the bars it can't do that. And lastly slower isn't safer or easier. Without momentum you are much more likely to fall over or hit something.