Site Reliability Engineering

(Book) Site Reliability Engineering - https://landing.google.com/sre/book/index.html
(Book) Site Reliability Workbook - https://landing.google.com/sre/workbook/toc/
(Book) Building Secure and Reliable Systems - https://landing.google.com/sre/resources/foundationsandprinciples/srs-book/
(Course) Intro to DevOps - https://br.udacity.com/course/intro-to-devops--ud611/
(Course) Google Cloud Platform for Systems Operations - https://www.coursera.org/specializations/gcp-sysops
(Course) Measuring and Managing Reliability - https://www.coursera.org/learn/site-reliability-engineering-slos

Operating Systems

(Course) Introduction to Operating Systems - https://br.udacity.com/course/introduction-to-operating-systems--ud923/
(Course) Advanced Operating Systems - https://br.udacity.com/course/advanced-operating-systems--ud189/

Automation

(Tutorial) Ansible - https://www.digitalocean.com/community/tutorials/configuration-management-101-writing-ansible-playbooks
(Course) Terraform - https://www.udemy.com/learn-devops-infrastructure-automation-with-terraform/learn

Distributed Systems

(Tutorial) Introduction to Distributed Systems Design - http://www.hpcs.cs.tsukuba.ac.jp/~tatebe/lecture/h23/dsys/dsd-tutorial.html

Networking

(Book) Understanding Linux Network Internals - http://shop.oreilly.com/product/9780596002558.do

Programming Languages

Python

(Book) Learn Python 3 The Hard Way - https://learnpythonthehardway.org/python3/
(Course) Developing Scalable Apps in Python - https://br.udacity.com/course/developing-scalable-apps-in-python--ud858/

Go

(Book) The Go Programming Language - https://www.amazon.com/Programming-Language-Addison-Wesley-Professional-Computing/dp/0134190440
(Webinar) https://www.youtube.com/watch?v=Q_H4hrUez80 (Go Language for Ops and Site Reliability Engineering)
(Hands On) https://gopherlabs.kubedaily.com/

Production Web App

(Tutorial) https://www.digitalocean.com/community/tutorial_series/building-for-production-web-applications
(Book) Production Ready Microservices - https://www.amazon.com/gp/product/1491965975/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1491965975&linkCode=as2&tag=susanfowler-20&linkId=8e434210b002d00be8507454a75c11ff

Monitoring and Logging

(Course) Monitoring and Alerting with Prometheus - https://www.udemy.com/monitoring-and-alerting-with-prometheus/landing-page/
(Book) Prometheus UP and Running - https://www.amazon.com/Prometheus-Infrastructure-Application-Performance-Monitoring/dp/1492034142

Continuous Integration | Continuous Delivery

(Course) Continuous Deliver Better Software - https://www.udemy.com/learn-devops-continuously-deliver-better-software

Containers

(Course) Docker for Devops - https://www.udemy.com/docker-tutorial-for-devops-run-docker-containers

Web Servers

Nginx

(Course) Nginx Fundamentals - https://www.udemy.com/nginx-fundamentals/

Cluster Management

Kubernetes

(Tutorial) Kubernetes Bootcamp - https://kubernetes.io/docs/tutorials/kubernetes-basics/
(Course) Scalable Microservices with Kubernetes - https://br.udacity.com/course/scalable-microservices-with-kubernetes--ud615/

Cloud

Amazon AWS

(Tutorial) Amazon AWS - https://aws.amazon.com/getting-started/tutorials/

Post-Mortem

Blogs

DevOps | SRE Roadmap

Further Reading

Awesome SRE link directory

Image Credits: https://github.com/kamranahmedse/developer-roadmap