unix/linux command reference
Coding and programming
Linux/Mac OS X Command Cheat Sheet
Front-end Development/Back-end/Data Science
Keep This Python Cheat Sheet on Hand When Learning to Code http://lifehacker.com/keep-this-python-cheat-sheet-on-hand-when-learning-to-c-1655521825
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Learning bash scripting for beginners
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Web & Design
linux admin quick reference
Free Online Courses for Homeschoolers for Software and Web Development | The Happy Housewife
Affording the Homeschool Life
Linux Shell Script Guide