This video covers adding pages and posts to WordPress. It covers adding a blog to the site and making it different from the home page, setting your home page and adding an image and simple gallery. Please note that it does not deal with page builders. Also, there might be some slight differences with a different theme but the concept is pretty universal.
A note on page builders, I am not a big fan and find page builder hard to use for beginners. When I find a page builder that I really love I will post a video on that topic.