Besides requiring certificates when you complete a path, you receive badges and reputations points for being active. Badges and reputations points appear on your Portfolio.
Add 2 points to reputations.
Add 10 points to reputations.
Add 20 points to reputations.
Add 50 points to reputations.
Deduct 10 points to reputations.
Deduct 100 points to reputations.