Assessment wanted for grid skill test 1 (Tasks 1-4)

MDN Learn
7

Could anyone check my code and give some opinion on it.

Code Links:
Task1: https://jsfiddle.net/a/1fup48qj/5/
Task 2: https://jsfiddle.net/khubaib1/1fup48qj/3/
Task 3 : https://jsfiddle.net/khubaib1/1fup48qj/1/
Task 4: https://jsfiddle.net/khubaib1/1fup48qj/