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Review security-sensitive code by tracing access decisions, testing denied cases, checking failure behavior, and revisiting changes before deployment.

Choose a C++ compiler and editor for Windows, macOS, or Linux, build a first program, and diagnose common setup errors.

Learn how the Linux kernel separates processes, checks privileges, and applies controls such as capabilities, seccomp, and LSMs—and what to verify on a system you administer.

Compare IntelliJ IDEA Community, Eclipse, and VS Code for learning Java, then test your JDK, debugger, and project setup with a small exercise.

Diagnose failed security lab exercises by checking the setup, locating the first failing boundary, making reversible changes, and confirming the fix.

Learn how 2FA protects accounts, compare authenticator apps, security keys, push prompts, and SMS, and set up recovery without locking yourself out.

Keep Git changes reviewable and sensitive data out of history with practical habits for branches, commits, reviews, releases, and recovery.

Practical steps for reviewing contributions, limiting CI access, checking dependencies, and publishing traceable open source releases.

Learn what packet captures can show, how to follow a connection in Wireshark, and why observation points and missing packets matter.

Learn how parameterized queries prevent SQL injection, where placeholders cannot be used, and how to review and test database code safely.