Its a Mix Up of free and paid.

There are no prerequisites. Our courses are open to students of all backgrounds who are 18 years of age and older.All courses are conducted in English. Video lectures include English subtitles and the option to slow-down, pause, or replay lectures for better retention.

No, This is made only to provide links of great tutor with great courses in free or paid.

It is ongo course you can learn it anytime anywhere as per your convinence