Technically, there is no limit to the number of skills you can add to your profile on Matter. That being said, we recommend you add or create between 3-8 skills.
As a new user, if you add more than 10 skills, it will take Matter algorithms longer to learn how to provide with you the highest quality of feedback.
Once you receive feedback from your channel members, you can add additional skills that you care about. Rinse and repeat!