Eric Eric, you have never answered questions about your true role in your explorations. Most teachers I know will spend time learning things independently before asking questions. As suggested, many of your questions could have been answered by reading the Moodle docs or using simple Internet searches. Yet, we remain patient with your methods.
If one is not a teacher or has never taught a course, learning Moodle could be challenging. Furthermore, learning any LMS requires computer skills (e.g., reading documentation, searching the Internet, and experimentation).
You have been pointed to many great resources for learning to use Moodle. Many of your questions have already been asked on Moodle.org, had you done a simple search.
If you want to learn Moodle's features, if this is what you are asking, I suggest that you first learn to install Moodle (sandbox) on your computer. Then, you can experiment with three major roles: Manager, Teacher, and Student. As a Manager, you can control some of Moodle's settings. As a Teacher, you can create course elements. As a student, you can use what the Teacher created and see Moodle as a student sees Moodle. When I learn Moodle, I go back and forth between these roles.
You appear to want us to hold your hand and step you through Moodle, one step at a time. If this is what you need to learn, it would be best to take a course in Moodle. (I believe Mary offers courses, but I forget students' expectations. I think her courses are quite good.) Teachers commonly use this approach at schools using Moodle, via their Instructional Design department, for example. If one is unwilling to take a course, use your IT department, not read documents or books, and not use the wealth of information available on the Internet, one will have a hard time learning. As another suggestion, there are courses on LinkedIn Learning teaching Moodle. LinkedIn Learning appears to offer the first month membership for free.