GitVersion the change
CI/CDBuild & release
KubernetesRun & reconcile
COMMUNITY
Build alongside
people like you.
Share what you’re building. Find people working through the same challenges.
Explore the community ↗YOUR DEVOPS & CLOUD LEARNING SPACE.
Learn DevOps
the way engineers think.
Learn through structured paths, visual explanations, and practical projects. Prepare for cloud certifications and connect with students building alongside you.
Try your first lesson. Create a free account to keep learning and connect.
Understand. Build. Operate.
THE LEARNING PATHS
Find your next step.
Build a foundation or go deeper into the work.
Each path explains how its pieces fit together.
Showing all 12 learning paths.
New to DevOps?
Start with Linux, Networking, and Git. Then bring them together.
MORE THAN AN EXPLANATION
Understand the system.
Connect it to real work.
Architecture, visual explanations, published company cases, and interview questions. Four ways to turn a lesson into understanding.
ARCHITECTURE THINKING / SYSTEM DESIGN
Read the architecture.
Understand the trade-offs.
Follow requests, data, and dependencies through a system. Learn when queues, caches, and replicas help, what they cost, and how they fail—so you can explain a design and know what operating it involves.
WHAT YOU TAKE AWAY
Explore System Design Know what to use, when to use it, and what to watch.
SYSTEM DESIGN / TRADE-OFFSConcept preview
When should work move to a queue?
01ServiceAccepts the work
02QueueBuffers the burst
03WorkerProcesses the task
WHAT YOU GAIN
Handle bursts.
Scale workers independently.
WHAT YOU MUST HANDLE
Delayed results.
Retries and duplicate delivery.
Choose a pattern by its constraints and failure behavior.
CI/CD / LESSON INFOGRAPHICFrom the learning path
PUBLISHED ENGINEERING / COMPANY CASESLearn the decision
CANARY ANALYSISWhat evidence makes a release safe?
Compare the candidate with a baseline before promotion.
SRE / SLO THINKINGWhich reliability signals matter?
Start with the user experience, then set the target.
DATABASE POSTMORTEMCan the backup actually be restored?
Verify recovery before you depend on it.
Understand the context. Take the principle. Adapt it to your scale.
GIT / INTERVIEW DEPTHLesson example
Q
“I changed the configuration before committing. Why does production still have the old value?”
BUILD YOUR ANSWER
- 01Locate the edit: working tree, index, or commit.
- 02Check which commit was pushed.
- 03Compare it with the deployed revision.
git diffgit diff --stagedgit show HEADExplain what each check proves.
PROJECTS & ARCHITECTURE
Real decisions.
Practical projects.
Learn from a published company case. Understand the architecture
decision, then build a smaller version in your own environment.
01 / DELIVERYNetflix case
Google SRE case
GitLab case
Netflix case
CANARY ANALYSISRelease safely.
02 / RELIABILITYRelease safely.
Roll back with evidence.
Build two versions behind a proxy. Introduce a failing canary, compare user requests, then prove the rollback.
WHAT YOU PROVEDetect a bad release. Verify recovery.
Local apps + proxyExplore guide
Google SRE case
SLO THINKINGMeasure what
03 / RECOVERYMeasure what
the user experiences.
Instrument a local service. Define a useful SLI and SLO, then connect failures to an actionable alert.
WHAT YOU PROVEExplain the signal. Justify the alert.
Local service + metricsExplore guide
GitLab case
DATABASE POSTMORTEMA backup is a promise.
A backup is a promise.
A restore is proof.
Restore PostgreSQL in a separate local environment. Verify the records and document what recovery actually takes.
WHAT YOU PROVERecover the data. Record the evidence.
Local PostgreSQLExplore guide
AWS & GOOGLE CLOUD / MOCK EXAMS
AWS & Google Cloud.
Mock exams. Clear explanations.
Prepare with explanations, timed practice,
and a review that shows where to focus next.
LEARN WHY AN ANSWER FITSGet the reasoning.
Get the reasoning.
Keep the lesson.
Check each answer and read its explanation as you practise. Connect the choice to the cloud concept behind it, without a timer rushing you.
- Feedback after each answer
- Explanation of the correct choice
- Practice at your own pace
Practice, timed exam, and review. Explore a full exam below.
CLF-C02 · Interface previewPRACTICEWhich is a benefit of cloud computing?
WHY B FITS
Replace upfront infrastructure investment with usage-based spending.
AFTER SUBMISSIONTurn mistakes into
Turn mistakes into
your next study plan.
All answersIncorrectFlagged
THIS QUESTION / CLOUD CONCEPTSCapital expense → Variable expense
Review the explanation, then revisit the cloud cost model before your next attempt.
Score by domainAnswer explanations
Explore AWS mock exams
Cloud Practitioner · Solutions Architect Associate
8 mock exams4 CLF-C02 · 4 SAA-C03
Explore Google Cloud mock exams
Digital Leader · Cloud Engineer · Cloud Architect
8 mock exams2 CDL · 4 ACE · 2 PCAIndependent certification practice. The preview illustrates the learning experience.
THE OPERATING BELT
OPS Factors.
A practical reference for the systems behind the software. Explore operational maturity across DevSecOps, SRE, Platform Engineering and MLOps.
18domains
196factors
0–4maturity scale
ONE CONNECTED SYSTEM100% COMPOSITE WEIGHT
Explore the full assessment model ↗THE STELLAR METHOD
Go deeper than
the command line.
Understand what happens underneath.
Then build something that works.
01↗02↗03↗
Build the foundations.
Connected learning paths, from Linux and networking to cloud infrastructure.
See the whole system.
Visual explanations, architecture and real engineering decisions.
Turn knowledge into practice.
Work through projects, reason about failures and test your understanding.
FROM COMMIT TO RUNNING SYSTEM
Understand the feedback loop.
Explore SRE ↗Observe the result. Trace the failure. Improve the next release.
YOUR LEARNING WORKSPACE
Keep your momentum.
Your next lesson, a useful conversation,
or a clearer way to think through a problem.
Build alongside
MY LIBRARY
Your knowledge.
Always within reach.
Save lessons and sections. Pick up the thread when you return.
Open your library ↗TARS BY STELLAR
Your personal
DevOps Tech Lead.
Bring DevOps instructions to your own ChatGPT or Claude project.
Meet TARS ↗BEFORE YOU START
A clear place to begin.
Where should I start if I’m new to DevOps?
Start with Linux, Networking, and Git. Add Bash & Python for automation, then explore containers, cloud, and delivery. Each path gives you a focused next step.
Where do I run the projects?
You build the environment yourself, following the guide. The featured projects can be practised locally; cloud alternatives are included where relevant. STELLAR provides the explanation and execution route, while you run the tools on your machine or cloud account.
How do the mock exams work?
Practice mode lets you check answers and read explanations as you go. Timed mode hides answers until submission, with a timer and question flags. After submitting, review your practice score, domain breakdown, and incorrect answers.
Do I need an account?
Browse the learning paths and try your first topic. Create a free account to open more topics, personalise your profile, and message other students. Lesson progress is saved in your current browser.
What is TARS?
TARS is your STELLAR learning companion. Search topics, explore prepared explanations in Arabic or English, and jump to the relevant lesson. You can also take TARS instructions into your own ChatGPT or Claude project from the TARS page.
UNDERSTAND. BUILD. OPERATE.
Make your next
step count.
You do not need to learn everything at once.
Start with one path. Understand it well. Connect the next piece.