Locked In: Prep for Linux+

Locked-In is a bite-sized study companion for the CompTIA Linux+ (XK0-005) exam. Built for people who study in 10-minute windows — on the train, on lunch, or between shifts. Every lesson is short, focused, and ends with a quick-check so you know what stuck. WHAT'S INSIDE - All 4 Linux+ exam domains — System Management (32%), Security (21%), Scripting, Containers & Automation (19%), and Troubleshooting (28%) - Short lessons with visual diagrams for the filesystem hierarchy, permissions, systemd, SSH, SELinux/AppArmor, firewalls, Bash, cron, Ansible, Docker, Kubernetes, and more - Inline quick-checks at the end of each lesson - A practice bank of 322 multiple-choice questions, organized by domain and difficulty - Scenario performance-based questions (PBQs) — categorize, ordering, and matching - A timed mock exam: 60 questions, 90 minutes, with flag-for-review and a final review screen - Flashcard deck with SM-2 spaced repetition covering commands, file paths, signals, and key concepts - Searchable glossary of every Linux+ term and command you will see on test day - Progress tracking, study streaks, bookmarks, and personal notes - Weak-spot review that surfaces the topics you keep missing WHO IT'S FOR - IT professionals prepping for the Linux+ exam alongside their day job - Help-desk and support technicians moving into Linux administration - Students and career changers building Linux skills - Anyone who learns better in short, focused sessions than long lectures WHY LOCKED-IN - Works fully offline — no account, no tracking, no ads - One-time unlock, no subscription - Built by an indie developer, not a content mill - Content aligned with the current CompTIA Linux+ XK0-005 exam objectives FREE TIER Domain 1's first topic is fully free, plus a preview lesson from every other domain. The one-time $9.99 unlock opens every lesson, the full 322-question practice bank, the performance-based questions, every flashcard, and the timed mock exam. PRIVACY Locked-In stores your progress on-device. No analytics, no third-party SDKs, no data sold or shared. DISCLAIMER Not affiliated with, endorsed by, or sponsored by CompTIA. CompTIA(R) and Linux+(R) are registered trademarks of CompTIA, Inc. Linux(R) is a registered trademark of Linus Torvalds. Locked-In is an independent study aid.