Hey there! Welcome to bitcoin! There isn't really such thing as free money, nor "free" bitcoin. However, there are a few relatively easy ways of earning bitcoin on/through this forum.

1. Faucets: Low income method where you click on a "Claim" button every so often and fill a captcha for a very small amount of bitcoins. Can be a good way to earn an bit to play around with

2. PTC: Pay to click, you essentially click and watch ads for a small amount of bitcoin

3. Signature Campaigns: A bit long to explain, check out this link for info on what they are and who to apply to. Generally higher income based on member rank https://bitcointalk.org/index.php?topic=615953.0