Joomla Training and Tutorials
Joomlashack University, along with OS Training, are the two top Joomla! training course developers today. The choice truly is between these two providers. StartLearningJoomla.com has ceded the field to them given the massive breadth and quality of the material they have been putting out year after year. If you are choosing a training source, the choice must be either Joomlashack University or OS Training.
Templates and Extensions
Joomlashack has been the leader in Joomla! templates and extensions literally since the day Joomla was founded (September 2nd, 2005). They wrote the first template design guide for the Joomla! project itself. They are the original and still the best when it comes to free and commercial templates and extensions.
Joomla-specific SEO Training
Joomlashack has an excellent program focused specifically on helping your Joomla site rank as high as possible in search engines. While Joomla has some basic SEO functionality built-in, it requires significant work to take it to the next level and rise above other sites online.