While living and working at mr,freelands what does douglass teach some of his loved fellow slaves!

Douglass taught them how to read.

I succeeded in creating in them a strong desire to learn how to read. This desire soon sprang up in the others also. They very soon mustered up some old spelling-books, and nothing would do but that I must keep a Sabbath school. I agreed to do so, and accordingly devoted my Sundays to teaching these my loved fellow-slaves how to read.