Understand preferred URLs and avoid conflicting signals across duplicate page versions.
Identify genuine duplicates first
Some URLs show the same main content despite having different parameters or paths. Build a small inventory with the URL, why it exists and whether customers need it. Do not assume two pages are duplicates merely because they cover related services; distinct pages may answer different questions.
Choose a consistent preferred version
Canonical annotations and redirects can help signal a preferred URL, but Google determines which version it selects. Keep internal links and sitemap URLs consistent with the version you intend to promote. Conflicting signals make the setup harder to maintain and investigate.
Do not use canonical tags as a shortcut
A canonical pointing to an unrelated page is not a substitute for useful content. Before changing site-wide templates, test representative pages and check that each annotation points to the intended destination. Keep a record of exceptions such as filtered pages or campaign parameters for your developer.
Verify after the release
Inspect representative URLs in Search Console and review the selected canonical where available. Also check that the destination loads correctly for visitors. Changes may take time to be processed, so compare a documented configuration with later observations instead of repeatedly changing settings without evidence.
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Reference: Google documentation: Technical SEO.