Evidence hierarchy
- Certification issuer / official program source
- Official documentation, policy or exam objectives
- Primary vendor compatibility documentation
- Strong secondary sources for context only
- Marketplace/user discussion only when clearly labeled as anecdotal
Changeable facts
Price, exam duration, objectives, prerequisites, retake policy, certification validity and active/retired status are rechecked before they are presented as current. Where a provider's live page is inaccessible or region-specific, the site avoids false precision.
Amazon content
Without approved dynamic Amazon product-data access, the site does not hard-code Amazon prices, marketplace star-rating data, popularity metrics, availability-style claims or copied buyer quotations. Product recommendations are based on durable use cases and stated specifications, not claims of first-hand testing.
Affiliate treatment
Affiliate destinations are centrally configured. Affiliate links are disclosed and marked as sponsored/nofollow. Editorial pages do not require an affiliate call to action when it would not help the user.
When a source changes materially, affected pages should be updated at the smallest practical scope and their review dates should advance only after the relevant claims have been rechecked.