Understanding Cache Tags in Drupal Caching

Ovanes Budakyan's latest blog post, the second installment in a series on Drupal caching, focuses on cache tags and their role in enabling precise and efficient cache invalidation. Cache tags are tied to specific Drupal data dependencies, such as nodes or taxonomy terms, ensuring that only relevant cached content is updated when data changes. 

The post provides examples of common cache tags, explains how to add and invalidate them in code, and highlights debugging tools like cacheability headers, HTTP header inspection, and database queries. It also covers adding cache tags to render arrays and invalidating them with Drush commands, emphasizing their importance in maintaining optimized and fresh cached content.