How do we make a scrolling platformer which moves up, down, right or left when we click the respective keys (I am talking about cursor keys) with a sprite, like the among us games? I need help in this because i am new to it, and i have made no such projects.

when green flag clicked
say [Hi! I'm Wonderlandgamer!]

Do you mean a top-down game?
Also you can always look for tutorials:

• Top-down scroller tutorial (Griffpatch)
  
• Scrolling tile-based platformer tutorial (Griffpatch)
  
• Scrolling platformer tutorial (Griffpatch)