What does this mean "Alternate page with proper canonical tag"

[Abby]

Hi I got my monthly Google console report, my big issue is "Alternate page with proper canonical tag". what does it mean can any one here explain it to me please.

[Toons-man]

From Google AI

""Alternate page with proper canonical tag" is not an error, but a status in Google Search Console that indicates Google found duplicate versions of a page but correctly identifies and indexes the preferred version via a canonical tag. To ensure your site is performing optimally, you should identify and verify the canonical tag on your preferred pages to confirm it correctly points to the main version and to ensure that duplicate pages are intentionally treated as such."

[shoopa]

Google search console keeps me up some nights