Ruby on Rails Gem

System Design: Messenger service like Whatsapp or WeChat - Interview Que...

Git Basics

Git guide
Pro Git by Scott Chacon

Some good reading

Howard Marks Memos (OakTree Capital)
Warren Buffett Letters
Jeff Bezos Letters

Tell Me About Yourself - A Good Answer to This Interview Question

Twitter Scalability

https://www.infoq.com/presentations/Twitter-Timeline-Scalability
https://www.quora.com/How-do-I-prepare-to-answer-design-questions-in-a-technical-interview

Zig Ziglar - Evaluate Where You Are