'Discovered – currently not indexed'
Google knows the URL exists but hasn't crawled it. Usually a sign of weak internal linking or low site authority. Link to the page from a strong, already-indexed page.
'Crawled – currently not indexed'
Google fetched the page and chose not to keep it. Almost always a content quality signal — thin, duplicate, or low-value content. Rewrite, expand, or merge.
'Blocked by robots.txt'
Self-inflicted. Edit robots.txt to allow the path, then request indexing.
'Page with redirect'
The URL you submitted redirects elsewhere. Update internal links and sitemaps to point at the final destination.
'Alternate page with proper canonical tag'
Not an error — Google chose to index the canonical instead. Verify the canonical target is the URL you actually want indexed.