SEO
Canonical and hreflang: how to implement them properly (and the mistakes that cancel them)
What the canonical tag does, what hreflang does, how to combine them on a multilingual site with x-default, and the mistakes that make Google ignore them.
Topic
Articles about Indexing
2 articles · Indexing: practical guides, examples and explanations written by Aimran.
SEO
robots.txt versus noindex: what each one does and when to use them
robots.txt controls crawling and noindex controls indexing. What happens when you combine them badly, how to handle internal search and filters, and how to check it.