When creating guides you must select what type of guide it is. This is to help with discoverability as users can sort by these types on the LibGuides landing page. Below are the types and what they represent/why you would select them.
On the LibGuides homepage click on "Create Guide" in the LibGuides Shortcuts section
Once you have done that it will give you an option to select what type of guide you are creating in the drop down under "Guide Type"
If you need to change the type for a guide after you have created it you can do so by selecting the guide in LibApps and then clicking on the edit symbol (the little pencil) next to Type/Group.