If you follow links to documentation on the EFL website, it will get you to here:
That has some overview docs (including a C primer), but it is not comprehensive.
For example, here is the program guide page for information about the main loop: https://www.enlightenment.org/program_guide/main_loop_pg
Each program guide section has the menu of program guides (at the top and bottom of the page), in expandable lists.
For example, in the docs you might see the url:
But the real url should be:
Elementary docs are here:
The closest I can find to a full index is here:
It's not complete, however.