devops / devsecops

How to Learn DevSecOps for Free

Security can't be a gate at the end — it has to be built into the pipeline. Here's what "shifting security left" really means, what to automate, and the free resources to learn one of tech's fastest-growing specializations.

updated jul 2026·a 12-minute read·intermediate

DevSecOps bakes security into every stage of the DevOps lifecycle instead of bolting it on at the end. The old model (build everything, then hand it to a security team to review right before release) is slow and finds problems when they're expensive to fix. DevSecOps "shifts security left," meaning it moves security checks earlier: scanning dependencies, containers, and infrastructure code automatically in the pipeline, so vulnerabilities surface as code is written, cheaply and early. It's one of the fastest-growing specializations in tech precisely because software ships faster than security teams can manually review. This guide covers what DevSecOps is, the practices to learn, the free resources, and the mistakes teams make adopting it.

01 · WHAT IT IS

What "shift left" actually means

Picture the software lifecycle as a line from left (writing code) to right (running in production). Traditionally, security happened far to the right — a review just before release, or worse, after an incident. "Shifting left" means moving those checks toward the start: catch a vulnerable dependency the moment it's added, flag insecure code as it's committed, scan a container image before it's deployed.

The reason is economics and speed. A flaw caught as you write the code costs almost nothing to fix; the same flaw caught in production can mean an incident, a breach, and an emergency. Automation makes this practical — instead of humans manually reviewing everything, the pipeline runs security scans on every change, so security keeps pace with rapid delivery.

02 · THE PATH

The order to learn it in

You need some security and some DevOps first, then the integration. In order:

1. Security and DevOps foundations

Understand common vulnerabilities (the OWASP Top 10 is the vocabulary) and how CI/CD pipelines work. DevSecOps is the intersection, so a little of each comes first.

2. The scan types

Learn the main automated checks: SCA (scanning your dependencies for known vulnerabilities), SAST (scanning your own source code), and container/IaC scanning. Know what each catches.

3. Wire them into the pipeline

Add these scans as automated stages in CI/CD so every change is checked, and learn to triage results — distinguishing real risks from noise so the team doesn't ignore the tooling.

YOU'LL LEARNShift-left securityOWASP Top 10Dependency scanning (SCA)Code scanning (SAST)Container scanningPipeline integration

TIPStart with dependency scanning — it's the highest-value, lowest-effort win. Most modern apps are mostly other people's code (open-source libraries), and a huge share of real-world vulnerabilities come from outdated or vulnerable dependencies. Adding an automated dependency scan (SCA) to your pipeline catches these with almost no effort and immediately reduces real risk. It's the perfect first DevSecOps practice: easy to add, and it protects against one of the most common attack vectors.

03 · THE BEST FREE RESOURCES

Where to actually learn it (free)

Learn the methodology, practice on real vulnerabilities, and keep the secure-coding references close:

Methodology and hands-on. The OWASP DevSecOps Guideline is the community standard for embedding security into CI/CD — what to scan, when, and how. Snyk Learn offers free, interactive lessons on finding and fixing real vulnerabilities in code, dependencies, and containers.

The reference. The OWASP Cheat Sheet Series is the definitive free collection of secure-coding cheat sheets — the practical companion to the DevSecOps guideline for when you need to fix, not just find, a class of vulnerability.

OWASP Cheat Sheet Series ↗The definitive, free collection of secure-coding cheat sheets — the practical companion to the DevSecOps guideline.cheatsheetseries.owasp.org

04 · AVOID THESE

Common mistakes adopting DevSecOps

One trap is drowning the team in findings: turning on every scanner at maximum sensitivity so developers face thousands of alerts and start ignoring all of them. Another is treating security as still someone else's job rather than a shared responsibility. And some teams fall into blocking every build on every finding, which grinds delivery to a halt and breeds resentment toward security.

WATCHA scanner that cries wolf gets ignored — tune for signal, not maximum noise. The fastest way to make a whole team dismiss security tooling is to flood them with low-priority and false-positive findings. Start by failing builds only on high-severity, confirmed issues, and surface the rest as informational. As trust builds, tighten the rules. DevSecOps succeeds when developers see the tooling as a helpful safety net, not an obstacle that blocks their work with noise.

05 · TRY IT

Scan a project this weekend

DevSecOps clicks the moment an automated scan finds a real vulnerability in your own code before it ships.

TRY ITThe starter project: take one of your projects and run a free dependency scan on it (GitHub's built-in Dependabot alerts, or a Snyk scan). You'll almost certainly find at least one known vulnerability in a library you depend on. Fix it by updating the package, then add the scan to your CI pipeline so it runs on every push. You've just shifted security left — the core DevSecOps move — on a real project.

06 · FAQ

Frequently asked questions

What is DevSecOps?

DevSecOps is the practice of integrating security into every stage of the DevOps lifecycle, automating security checks in the pipeline so vulnerabilities are caught early rather than at the end. The goal is to keep software secure without slowing down fast, frequent delivery.

What does "shift left" mean in security?

Shifting left means moving security checks earlier in the development process, toward when code is written, instead of only reviewing security right before release. Catching issues early makes them far cheaper and faster to fix than finding them in production.

What should I learn first for DevSecOps?

Start with the fundamentals of common vulnerabilities, such as the OWASP Top 10, and a basic understanding of CI/CD pipelines. Then learn the main automated scan types and how to add them to a pipeline, beginning with dependency scanning as the easiest high-value win.

Do I need to be a security expert to do DevSecOps?

No. DevSecOps is about integrating security practices into development and operations, and many practitioners come from a DevOps or development background. A working knowledge of common vulnerabilities and secure practices is enough to start and grow into it.

Can I learn DevSecOps for free?

Yes. The OWASP DevSecOps Guideline and Cheat Sheet Series are free, and Snyk Learn offers free interactive lessons on real vulnerabilities. Combined with free CI/CD tools and dependency scanners, you can learn and practice DevSecOps at no cost.

Go deeper

Security spans DevOps and beyond.

CI/CD Pipelines Security cheat sheets Learn security (free courses)Security certifications Back to dashboard