1b. Something that an ignorant fuckwit who wouldn't know what to do with a book even if he/she owned one says when he/she finds out that you went further in education than him/her.
1b. "College? Me? Nah. School of hard knocks, mate, school of hard knocks."
Often used by those who couldn't/didn't go to college for whatever reason and instead went through hardships and disappointments.
2. Street Education of the obvious or Street Common Sense
"Girl you know better then to walk through Centarl Park at knight wearing that skimpy Skirt, you better go back to the School of Hardknocks"