I see that some courses have the word (Beta)
after the course names. What does it mean when that word is present? Are the courses not done, or are there bugs and spelling errors?
Just to be sure, I googled the meaning of beta, here is what I managed to get.
A beta course is a test run of a new course or coaching program that's released to a limited group of students for feedback. It's a way to test the content flow, and technology, and get feedback on improvements before the course is fully launched.
I think this is clear.
The courses are “done” but they are not well tested so there are bugs or issues that may need to be addressed as more users report on them.
Sections marked as “Beta” represent the most recent significant updates to the freeCodeCamp curriculum. These are courses that have been completely redesigned. While they have been the subject of careful design, testing, and public release, compared to the older courses, they are less stable. They are more likely to have bugs than older courses and are also still getting some changes and updates. For example, the team might choose to change the order of certain lessons, turn one lesson into two, or change the explanation of a lesson.