source/berkeley_humanoid_lite/ contains the IsaacLab environment and task definitions.
source/berkeley_humanoid_lite_assets/ contains robot descriptions (URDF, MJCF, and USD) and the script to export these description files from Onshape project.
source/berkeley_humanoid_lite_lowlevel/ contains the lowlevel code running on the real robot. Only contents inside this folder is required to copy to the robot. We will cover that part in a later section.