The Basic Rule in Cornering is to Slow Down before doing it
Every corner has a speed limit depending on the size and road surface conditions. In a blind corner, it takes time to see obstacles or any changes in road conditions. Braking while cornering will make you lose balance and fall. Key here is to reduce speed before the corner; then turn with a margin of safety.
The same procedure must be followed when turning left or right in an intersection. Make it a habit to collect information while riding.