Although disco, as we know is primarily a singles thang, some very good albums did emerge.
So, by way of the first steps towards a primer:
Chic, C'est Chic
http://youtube.com/watch?v=DxmDn2IzzhE
Donna Summer, Once Upon a Time
Candi Staton, Suspicious Minds
Norma Jean, Norma Jean
Michael Jackson, Off the Wall
http://youtube.com/watch?v=mq0PFb34Cjk
Shalamar, Friends.
http://youtube.com/watch?v=pVAm_obRPQ8
..
But don't get hung up on albums, a few good compilations will do. Neither Odyssey or Sister Sledge ever made a genuinely great album but as a single, both Inside Out
http://youtube.com/watch?v=bCkFebsGXxg and Greatest Dancer
http://youtube.com/watch?v=7LUie81E82k are virtually peerless.
And if any further evidence that Disco was genuinely fantastic is required, let's not forget:
http://youtube.com/watch?v=_XOY7lsBVpo
http://youtube.com/watch?v=-opY4qcidFk
http://youtube.com/watch?v=E5AVy6aSl4Y
http://youtube.com/watch?v=yio9zi_GPPs