Seth Lake is a gift to the aviation community. He is totally committed to educating pilots, from student to ATP. While he does an amazing job explaining the nuance of the ACSes for each of the certificates and several ratings, that and his ACE Guide gets into more detail than any other resource I've found.
And, he is alone in helping us avoid the snares that the FAA's army of lawyers have set, which appear intent on obfuscating the regulations, thus making them impossible to follow. On the last episode, Seth had a lawyer who, though he didn't say it in his own words, clearly point out how impossible it is for a normal person trying to comply.