Kindly note that the way the uppermost circle shows the progress is when one of the courses within the learning path is completed.
For example, if a learning path consists of 4 courses then the progress ball of the learning path will show 25% when one of the courses is completed. When the second course is completed the progress will go up to 50% and thereby it changes.

Words and their descriptions as suitable in this context -

Learning Path has several courses within it.

Course has several modules within it.

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