E-Credits are sort of like placement test courses. Rutgers considers them things you should have learned before college so they don’t count towards graduation credits or your GPA. But they do count towards you semester credit total (to help make you full time).
A full time students needs a minimum of 12 credits. So lets say I had 4 classes for the semester for a total of 14 credits. One of the classes is a 3 credit E-Credit course. My total semester credits is 14, but only 11 of those credits count towards graduation.
Also Elementary Algebra and Composition Skills are E-Credit courses, but Basic Composition is a real credit course.