Very easy.
1)Write trip or share photo video - max 100 credit
2)Put question or answer (one) - 1 credit
3)Make multiple account and put upvote for question answer of yours actual account - 1 for each upvote.
All leaderbord topper like me earn credit here in this method.
It's easy to earn post your trip experience, videos and photos
also you can earn via share with your friends, and one more feature that u can earn credits is ask and answer valuable questions.
So, it means that i can earn credit by following?
1) Write trip & sharing photo,video blog.
2) Asking question & answer.
3) Putting upvote to my own questions & answers through separate accounts or multiple accounts.
4) Inviting friends.
Any other?