Advice Needed What's the best way to gain credits? without having to use $

What I have translated on the information comments gets 1 and posts make 2 then if you offer content/resource and someone buys the access to it then it's another 2/per person who can use it and benefit from it. So just post good comments and go up 1, post a really good thread and then get 2, resources 2 + commission on the resource unlocked. So just use that to get a good idea.