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Free CompTIA Linux+ (XK0-006) study guide
Everything Ranger's Terminal teaches for CompTIA Linux+ (XK0-006), as a guide you can read on any phone or computer: 14 chapters and 187 lessons in plain words, with pictures, exam tips, questions to check yourself and a recap with a memory trick at the end of each chapter.
Read a chapter here, then practice it in the game, where 514 more questions, drills and mock exams show you when you are ready.
Start chapter 1 Play Ranger's Terminal
- 1Week 1: From power button to promptFrom power button to login · The map, the CPUs and the families · Kernel modules and device tools · When it won't boot · Boot configuration files · CPU architectures…Objectives 1.1, 1.2, 5.2
- 2Week 2: Disks, volumes and mountsDisks, partitions and filesystems · LVM: three layers · RAID, mounts and inodes · When storage misbehaves · Partition tools · Filesystem utilities · Software RAID with…Objectives 1.3, 5.2
- 3Week 3: Wired upNames: hosts, resolv.conf, nsswitch.conf · NetworkManager and Netplan · The network toolbox · Troubleshooting the network, layer by layer · Name resolution files ·…Objectives 1.4, 5.3
- 4Week 4: The shell, sharpenedEnvironment, paths and startup files · Streams and redirection · The text toolkit · Managing files and directories · When the shell can't find anything · Absolute and…Objectives 1.5, 2.1, 5.2
- 5Month 2: Backups and virtual machinesArchives and compression · Copying disks and syncing trees · Hypervisors and VM building blocks · Running VMs: tools, operations, networks · Archiving with tar and cpio…Objectives 1.6, 1.7
- 6Month 2: People and processesWhere accounts live · Adding, changing and retiring accounts · Seeing processes · States, priorities and signals · Scheduling: cron, at and anacron · When processes…Objectives 2.2, 2.3, 5.2
- 7Month 3: Packages and systemdPackage managers, both families · Repositories, trust and choices · Basic configs of common services · systemd units · Managing units, and systemd's helpers · Unit…Objectives 2.4, 2.5, 5.2
- 8Month 4: Containers and code-built serversRuntimes, images and layers · Running containers, volumes and networks · Orchestration: Compose, Swarm, Kubernetes · Infrastructure as code · CI/CD: from commit to…Objectives 2.6, 4.1
- 9Month 5: Who are you, and who said so?PAM and polkit · Central identity: LDAP, Kerberos, SSSD, Samba · Logging and auditing · Account hardening · Logs: journald, rsyslog, logrotate · The Linux audit system…Objectives 3.1, 3.4
- 10Month 5: Walls, doors and keysNetfilter and its front ends · firewalld and ufw · sudo, su and the root account · Secure remote access · Shrinking the attack surface · firewalld with firewall-cmd ·…Objectives 3.2, 3.3
- 11Month 6: Permissions, labels and denialsPermissions, all the way down · ACLs, attributes and SUID cleanup · SELinux in practice · Troubleshooting security issues · Permission denied: beyond chmod · Exposed or…Objectives 3.3, 5.4
- 12Month 7: Secrets, certificates and auditsData at rest · Data in transit, hashes and weak algorithms · Certificate management · Finding problems before attackers do · Integrity, destruction, supply chain and…Objectives 3.5, 3.6
- 13Month 8: Scripts, Python and GitScript building blocks · Decisions, tests and loops · Python basics for sysadmins · Git, day to day · Parameter expansion · Command substitution · IFS and OFS · if and…Objectives 4.2, 4.3, 4.4
- 14Month 9: Watching, tuning, and exam dayAI as a sysadmin's assistant · Monitoring: targets and data · Alerting that people trust · Reading the symptoms · From "it's slow" to a cause · Don't paste AI or…Objectives 4.5, 5.1, 5.5
- A–ZGlossary692 terms and 168 acronyms, each linked to its lesson
Questions
Is it really free?
Yes. The whole guide and Ranger's Terminal are free, with no ads and no sign-up. Nothing to download.
How is it organized?
It follows the official CompTIA Linux+ (XK0-006) exam objectives. Each chapter teaches a group of objectives, then gives you questions to check yourself and a recap with a memory trick.
How should I study with it?
Read a chapter, answer its questions before you open the answers, then play the same chapter in Ranger's Terminal: drills on what you missed, hands-on practice and timed mock exams show when you are ready.
Are these the real exam questions?
No. Real exam questions are kept secret. These are practice questions written to the published objectives, and every answer is explained.
More free study guides: A+ Core 1 · A+ Core 2 · Network+ · Security+ · AWS Cloud Practitioner · Azure Fundamentals · MD-102 · Apple Device Support
CompTIA, A+, Network+, Security+ and Linux+ are trademarks of CompTIA, Inc. Ranger Gamez is not affiliated with or endorsed by CompTIA. The practice questions are written to the published exam objectives; they are not real exam questions.