HOW TO AVOID FUMBLING?

In a certain code, RAL is written as KCTN and SPEAK is written as CGRUM. How will AVOID be written in that code?

Don't Make These 5 Biggest Mistakes During JEE MAINS Preparation | How To Avoid | JEE MAINS 2020

What is overloading? When does it occur? What does it cause? How can overloading be avoided?