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.)