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Q1 Which version of Drupal core should I install?

n brief, you should always run one of the recommended official releases. These can be found at the Drupal Project page.

At any given time, there are two major release series of Drupal which are supported. Currently, these are Drupal 6 and Drupal 7. Updated versions of each of these are issued on a regular basis. For example, within the Drupal 7 series, several versions have been and will continue to be released: 7.0, 7.1, 7.2, etc. These versions are sometimes collectively referred to as “7.x”; however, they are not all equal. The newest version in each series fixes problems that were discovered since the previous version, and these fixes sometimes include critical security updates. Thus, regardless of whether you are using Drupal 6 or 7, you should always run the most current version in the series.

In deciding between Drupal 6 and Drupal 7, several factors should be taken into consideration. Drupal 7 is newer, will be supported longer, and contains more features and enhancements than Drupal 6; therefore, if all else is equal, use Drupal 7. However, the releases of contributed modulesthemestranslations, and installation profiles compatible with each major Drupal release series sometimes lag behind Drupal itself, so if the functionality you need is not yet available for Drupal 7, this may affect your decision.

Drupal 8 is currently in development and is not yet ready for production use. When version 8.0 is released, Drupal 6 will no longer be supported or receive security updates, and you are strongly advised to upgrade your Drupal 6 sites to Drupal 7 at that time.