If you are using Joomla and want some help learning how to use it, then you can watch some online Joomla tutorial videos and learn how to use Joomla.
There are several resources online where you can watch tutorials online and get online Joomla training. Most people would rather watch a video that explains how to use software rather than read a large manual. That is why video tutorials are so popular now.
If you do not have the Joomla CMS installed, then these videos might not make much sense to you. It's best to first have Joomla installed correctly and then watch these videos so that you can follow along. You can pause the videos, go try what is being said and then unpause the video when you're ready to move forward.
Also, after you watch the video tutorials, you should make sure you go and work in the Joomla administration panel within 24 hours. This will help the training stick in your head and you'll retain the knowledge longer. As with anything, the more you use it, the easier it will become. Don't want all the videos in one sitting to help avoide being overwhelmed. Just watch 2-3 per day until you've seen them all and you'll learn and retain the knowledge.