When you need to know how a technology is meant to work, start with the specification, RFC, official guide, or reference page maintained by the team responsible for it. Find the section that addresses your question, read its definitions, then study its examples. You usually do not need to read a long document from cover to cover.
Why go to the primary source?
Secondary articles can be useful introductions, but several pages may repeat the same explanation, including an outdated or mistaken one. A primary source is closer to the rules or implementation you are trying to understand: it may define required behavior, document a particular product’s behavior, or explain how its maintainers expect you to use it.
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Asael Shinder captures the idea in his DEV Community essay: “The specification. The RFC. The official guide. The reference page maintained by the team that owns the code.” The essay’s search result shows “Sep 16,” but does not establish the year. Its broader claims about how people learn are the author’s perspective; no study or statistic is supplied to quantify them.
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Which source should you look for?
- A specification or RFC: Look here for protocol rules and defined behavior. Check the document’s date and whether a later document supersedes it before treating it as current.
- An official guide or reference: Use this for the behavior and commands of a specific software project or version. Documentation for one release may not describe another.
- A secondary explanation: Use it to get oriented or to clarify an unfamiliar concept, then verify consequential details against the applicable primary source.
How to read a long technical document efficiently
- Write down the concrete question. “What does this header do?” or “What does this isolation level guarantee?” is easier to investigate than “How does this system work?”
- Choose the source that matches the question. For a protocol, look for its specification or RFC; for a project-specific command or behavior, use that project’s official documentation.
- Search within the document. Use its contents, index, or page search to find the relevant section. Treat the document as a reference, not a book you must finish.
- Read definitions before interpreting familiar terms. Technical documents may give common words a precise meaning. A disagreement can turn out to be about terminology rather than the underlying behavior.
- Work through the examples. They can show how a rule applies, what inputs matter, and what result to expect. Compare them with the actual case you are trying to solve.
- Check version and date. Confirm that the document applies to your software release or the current standard. If the source points to a newer edition, follow that reference before relying on an older one.
Two examples of the habit
HTTP caching
RFC 7234, “Hypertext Transfer Protocol (HTTP/1.1): Caching”, is an Internet Standards Track document dated June 2014. It defines HTTP caches and related header fields, making it a primary place to investigate the rules it covers. Its date matters: for current work, check whether a later RFC supersedes it rather than assuming this edition is still the governing guidance.
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PostgreSQL transaction isolation
The PostgreSQL 16 documentation on transaction isolation explains SQL isolation levels, the phenomena used to distinguish them, PostgreSQL’s implementation, and the SET TRANSACTION command. Its version-specific explanation and examples are useful when the question is about PostgreSQL 16; consult the documentation for your own release when using another version.
What the method does—and does not—guarantee
Official documentation is not automatically the easiest explanation, and a specification may be difficult to read without background knowledge. A secondary guide can help you form the right question or decode unfamiliar language. The useful distinction is what each source is for: use an explainer to get oriented, and use the relevant maintained source to verify the definition, rule, version, or implementation detail that matters.
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