A superb Boxed Set Collection with excellent guides and lots of useful information:
Raspberry Pi 3: 2018 User Guide to Help You Get the Most Out of Your Raspberry Pi 3
Amazon Echo: 2018 Advanced User Guide To Understand Amazon Echo Fast & Easy: Step-by-Step Instructions
LINUX: Beginner's Crash Course: Your Step-By-Step Guide To Learning The Linux Operating System And Command Line Easy & Fast!
Windows 10: Complete User Guide: Microsoft Windows 10 for Beginners & Advanced Windows Users
CompTIA A+ Certification: The Complete Study Guide for Beginners to Pass Your CompTIA Exam Easily