Scratch

Hello! Blueblue Here! Just Gonna Tell You The Easiest Way To Do Background Scrolling. 11alex, Please Don't Write This Isn't The Proper Way Anymore. You Must Make Sprites That Are All REALLY Big. Make It Look Like They're Connected. For Each Sprite, Give A [Go To x, Go To y] Script. Change The Background's Color To The Color Of The Scrolling Sprites. Give Each Sprite An Arrow Key Movement Script. But Instead Of <when[ Right Arrow ]key pressed> <move( 3 )steps>
Do It Backwards, Like [ Right Arrow ]key pressed> <move( -3 )steps>
Notice The Minus? That's Right. Make The Scripts Backwards.
Normal Numbers Are Negative Numbers.
Negative Numbers Are Normal Numbers.
You've Learned How To Do BG Scrolling!