What Goes In The Folder in Load My Resources

The folder skips the assets level that a normal pack has. The namespace directory sits straight at the root:

resources/
  minecraft/
    textures/block/stone.png
    textures/item/diamond.png
    lang/en_us.json
    sounds/...
    models/...

Anything a resource pack can hold works here: textures, models, sounds, fonts and language files. A language file can rename blocks and items; a texture overrides the matching one from the game. Anything the folder does not contain falls through to whatever is underneath.