What are Category Pages? See an example with a category of posts on trees. Excerpts, thumbnails, titles with links can all be put on category pages.
Whenever you make a change to a permalink, you risk losing the search engine listings you have for a post. Also, if anyone has linked to that particular page or post, the link now goes to a missing page. The solution is: redirection.
If you have worked with both WordPress and Drupal, what do you see as the strengths of these two systems? Weaknesses? Here are three reasons to work with Drupal. But be aware that Drupal is not an easy system to learn.
Precautionary steps one should take in upgrading WordPress, Joomla! or Drupal and tales of CMS upgrades – upgrading one’s website can be a challenge of plugins failing, themes not working or tweaks being lost. Learn to upgrade carefully.