First, open the platform using your credentials and go to section “I can sell data”. Review descriptions of each task, assess your skill, as well as rewards system and choose one which fits you most.
Challenges differ by this criteria:
Schema
Each schema defines differen structure of data.
Payout
Each task may have different reward
Subtype
Some challenges require to create solution from scratch, while others require to fix or adjust existing code (pipeline which broke)