I also learned a damn lot about ODBII, CAN communications, CAN bus transceivers and ECU files. And I found this book for my Read Later bin:

“Car Hacker’s Handbook: A Guide for the Penetration Tester”

ISBN-13: 978-1-59327-703-1

Did you know `ncdu`? I’m using this for years to find out where all my precious disk space is lost. Unlike other solutions it works in a terminal and this way even on remote servers
 or gorram mobile phones always short on anything.