Use a light, stiff sheet of paper
Fold the plane symmetrically
Make sharp creases
Keep the wings even
Add a slight upward angle to the wings
Balance the weight near the front
Avoid oversized folds
Throw it gently and level
Launch it in still air
Adjust the wing tips after each test
Trim any uneven edges
Use a design built for gliding
Keep the nose pointed straight
Reduce drag by keeping folds neat
Test and refine repeatedly