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Practice real IT skills with instant feedback. Everything runs in your browser: nothing to install, nothing to break.

• A+ Certification Practice Original practice questions for CompTIA A+, with an explanation for every answer. Arcade practice with 3 lives, or a timed mock exam.
• LINUX · WINDOWS Terminal Practice Shuffled challenges on simulated Ubuntu, Rocky Linux, Windows Server (PowerShell and Command Prompt), and a Cisco switch and router: logs, permissions, packages, services, event logs, VLANs, routing, SSH, and tracking down attackers. Arcade practice with 3 lives, or a timed exam.
• VIM Vim Trainer Learn Vim in a pretend Vim: moving around, editing, operators, Visual mode, search and replace. Beat the keystroke par on every challenge.
• PRINTABLE Cheat Sheets Every Terminal Practice command for Linux, PowerShell, Command Prompt, and Cisco IOS, grouped by job, with what it does. Prints cleanly in black and white.

Coming later: more certifications.