 If we turn the editing on in our course by clicking the button top right or by going to the administration block and clicking the link turn editing on we can then rename our sections from for example topic one to a name that's relevant to us by clicking the cogwheel like edit icon. Different themes have different icons so you need to get used to the one that your theme has. Then if we uncheck use default section name we can then rename it to what we like. Alternatively we can use the formatting inside the summary. We can also use this to describe this section. When I click save changes at the bottom you can see that the topic section has been renamed and its name is also reflected in the navigation block in the current course link. It's possible with the editing turned on to move sections so I could move topic two which is not yet renamed up above topic one which has been renamed to reading. This course currently only has four sections and although we can go into the administration block in edit settings to change the number of sections we can also do this very quickly at the bottom by clicking plus to add a section or minus to delete a section. So if I click the minus here we now only have three sections in our course.