I recently started work on a game where you play a platformer but each attempt there are randomized coins. But I need a parallax background for it, I already have assets but I have no idea how, tutorials I found were either out of date, or for a really stupidly gimmicky game. PLEASE HELP!
You add a Parallax2D node and adjust its scroll parameters. Then you add a Sprite2D with your background under the parallax node.
Edit:
The parallax works if there is a moving camera in your scene, usually following the player. Set the scroll scale parameters between 0 and 1 to have the background move at a fraction of the movement of the camera.