There are many ways to complete a step on a learning path. A step is nothing more or less than a sum of knowledge, and it is possible that more than one course will provide you with all of this knowledge.
A course gives you a certain number of credits out of the number needed to complete a step. Therefore, you can choose the course - or courses - that will allow you to obtain all the credits necessary to complete a step.
See also the article : What is a credit?
See also the article: What is a learning path?