Site Architecture is how your pages are linked together. A bad structure traps "link equity" on your homepage and starves your deep content.
The "3-Click Rule" Myth
It's not about clicks; it's about Crawl Depth. A "Flat" architecture ensures that every page is within a short link-path from the homepage.
Best Practice: Siloing
Group related content under parent directories (e.g., /blog/seo/technical-guide). This creates thematic relevance. Ensure your navigation links to the main category pages, which then link to sub-pages.
Bad architecture creates Zombie Pages that Google can't find.
Visualize Structure: Zyro's Site Audit tool draws your architecture map automatically.