11 Free, Independent DevOps Learning Sites Worth Bookmarking in 2025

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A DEV Community contributor has compiled a list of eleven independent DevOps learning resources built by individuals and small teams, distinct from vendor content and certification-focused platforms. The list includes tools like SadServers, which presents broken Linux environments for hands-on troubleshooting practice, and Roadmap.sh, which maps the entire DevOps field as an interactive dependency graph. Other highlighted resources include the 12factor.net methodology document, DevOps Daily with browser-based simulators, and Killercoda, which inherited much of Katacoda's interactive scenario library after O'Reilly shut it down. The author notes these sites lack marketing budgets and some have uneven coverage, but are valued precisely because they were built to fill genuine learning gaps rather than sell products or exams. Each resource was verified as active before publication, addressing a common problem with curated lists of this kind.

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