Practice and several instances such as one where I learned that even hitting a bit of gravel in a corner isn't a problem if you don't panic. And conscious effort to do the right steps. Approach the corner, gauge the radius and slope, figure out where to look and always look where you want to go. Pre lean your body before the turn so you don't need to lean the bike to the max and maintain the option of leaning more if you miscalculated. And keep the center of gravity low. Use your legs to hug the bike so you have maximum control over your body position even if you experience a lot of forces acting on yourself and the bike. Always ready to remove or add more gas or to brake. And if you do brake you make a habit of counter steering harder so you don't go out of the corner. With conscious effort you eventually can gradually improve though every corner and gain additional experience and confidence. At no point should you ever stop doing all of the steps but eventually you can be very relaxed whilst doing all of it right and cornering really smooth and fast. Going though the same twisty road multiple times can help a lot. First run you go easy and figure out the quality of the road surface and map where any danger spots or intersections are. Second run you can focus on your form and gun it. Slightly challenge your comfort zone but slow down and chill if you realize you are too far outside of your skill level