Multilevel lists (MLs) are a great way to organize your content into smaller chunks. The idea behind MLs is that you can read about your topic and draw some associations based on the information you learn. When you create an ML file, it includes all the topics you want to highlight in one place, so it makes it easy for you to remember them later. The list is not a plain text list of words that are strung together in a certain order. This list contains the normal text that is selected by the user when he or she selects one or more words in the multilevel list.
Multilevel lists are considered to be an excellent way to control what you want to include in your content. For example, if you have a product description for your online store, you may want to use multilevel lists to limit which words are included in your description - so you won't have something like "Proudly made in the USA" being included because it's not what's important for your customer.