I'm going to suggest works mostly written FOR the marginalized audience because I think it's good to read stuff that doesn't center one's learning as a privileged person (or, if one is a marginalized person, to read stuff that DOES center oneself!) I'm also not going to suggest blogs because, uhh, because I feel like suggesting books instead!
Audre Lorde, Sister Outsider
Gloria Anzaldua, Borderlands
Andrea Smith, Conquest
Roxanne Dunbar-Ortiz, Blood on the Border: A Memoir of the Contra War
King, "Letter from a Birmingham Jail." (Really!)
Frederick Douglass, his autobiography, and get Angela Davis's critical edition if you can.
Sorry I don't have a lot of ideas for books on disability and ableism.
Edit: Oh, oh! No, wait! Look for Gabor Maté, especially Scattered Minds: A New Look at the Origins and Healing of Attention Disorder, When the Body Says No: The Cost of Hidden Stress
, and In The Realm of Hungry Ghosts: Close Encounters With Addiction.
Gabor Maté rules so hard, if you want to spend half an hour watching something amazing watch this interview
with him (has transcript.)