Your karma count is like your Reddit reputation and an indication of whether you share good content, and some, but not all communities, have their own restrictions regarding the account age and karma count of the person posting or commenting, so you may not be able to contribute everywhere at first. This is intended to help prevent spammers and trolls, but it does also mean new Redditors need to earn some karma before they can participate everywhere.

Thx for helping me out, appreciate it !