I have read your blog on How can you extend Drupal functionality using hooks.It was very interesting and helpful but I can add some extra points in your article. Here some extra points:
1.Overview.
2.Themes.
3.Contributed modules.
4.Installing Modules.
These are some extra points to add to your article. Readers if you are confused about your web and App development , you can get a free consultation at Alakmalak technologies.Visit our site for more information.