Once you logged in, you would want to get moving, and I can understand the excitement of your new website. All of your hard work is paying off, and I am sure you would want to get started immediately. However, there are things you would want to do. The first is to install any plugins you may want. For me, I install Classic Editor, and Classic Widgets. Once these plugins are activated, you would have a standard form for adding new content, and making changes. The newer style tries to act like a word processor, and I personally could never get to using it properly. If you find you have the same problem, then these two plugins will be essential. If you activate a plugin, and want to try the site without the plugin, use the form drop down menu, and select deactivate after you select the plugin you wish to deactivate.