Adaptive skill practice — find your level, get sharper.

Security practice

Think like an attacker and a defender

Application and software security in depth — the OWASP Top 10 and injection/access-control flaws, threat modeling (STRIDE, trust boundaries), authentication vs authorization and the protocols (MFA, sessions, JWT, OAuth2/OIDC, SAML), cryptography fundamentals (hashing vs encryption, symmetric vs asymmetric, signatures, HMAC, KDFs, TLS/PKI), secrets management, and supply-chain security. Goes deeper than the web-fundamentals security slice. Part of the Developer track.

• Meets you at your level — never too easy, never too hard.

• Adapts every question to how you’re doing.

• Tracks your level over time. Skill practice, not a test.

New here? Read the Security guide

A free 18-minute primer — the mental model, the mistakes beginners make, and what to practise first.

Curriculum

231 concepts across 26 chapters, from foundations through advanced practice — each one a concept the adaptive question bank can teach and test.

A. Security principles and the trust model

B. Threat modeling and risk

C. Vulnerability taxonomy and the OWASP Top 10

D. API security

E. Access control and authorization

F. Injection

G. Cross-site scripting and output encoding

H. The browser security model, CORS and response headers

I. CSRF, SSRF and the confused deputy

J. Authentication, sessions and cookies

K. Password and credential storage

L. Tokens: OAuth 2.0, OIDC and JWT

M. Cryptography fundamentals

N. Key management and cryptographic misuse

O. PKI and TLS

P. Network and infrastructure security

Q. Cloud, container and Kubernetes security

R. Software supply chain

S. Secure SDLC and security testing

T. Attack lifecycle, detection and incident response

U. Secrets, logging and data protection

V. Email and domain security

W. Memory safety and the low-level weakness class

X. Privacy, compliance and governance

Y. File upload and handling

Z. Automated abuse of valid functionality

View the full curriculum →

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