Depending on a course you may need to make sure that you’ve clicked on every interactive element within the course to ensure that your course is marked as completed. Introduction to Python course is a good example. Some sections within a topic are not complete:

 

To get the “Using an Editor” section completed you need to expand all dropdowns in this section:

Likewise, to get “Working in the Shell” section completed you need to look at both slides in this section:

Finally, if you didn't answer a question from the first attempt you need to give it another go until there are no attempts left:

Now we can see that all three topics: “Using an Editor”, “Working in the Shell” and “Knowledge Check” are marked as completed:

Remember, the course won’t be marked as completed even if there is one topic in a module section, which is not completed.