HTTP Bin is a useful website that provides a live service to return standard responses for specific HTTP requests. HTTP Bin has recently updated its look and provides a Docker image so you can run their service in your own Docker environment.
docker run -p 80:80 kennethreitz/httpbin
Git Cheat Sheet is a collection of what I consider useful git commands.
This Docker vs LXC (Linux Containers) article describes the difference between Linux Containers and Linux Environments, and then the difference Linux Containers and Docker.
My current favorite Node Style Guide.
Learn Angular and then read the Angular Style Guide.
This Youtube video focuses on hwo to develop real-time data pipelines with Apache Kafka.
Check out the basics of Hadoop.