What are the rules for all of this?
We're glad you asked! We do have a handful of rules regarding Badges and Best Answers. These rules and guidelines are to ensure that nobody abuses either of these features. Please be sure to adhere to these guidelines.
When and where can I select a Best Answer?
If it is a thread that you created, feel free to select whatever answer helped you solve your problem, or the answer that is most appropriate. If it is not a thread that you created, unless the OP explicitly asks you to do so, please leave the selection to the OP or a staff member.
The exception to this is if you come across an old thread (2 months or longer since the last response) that has not had a Best Answer set. In this instance, it is acceptable to select a Best Answer if one is available.
When and where can I remove a Best Answer?
Just like above, if it's your thread, you can do it any time, especially if it was a mistaken selection! If it isn't your thread, you should never remove it unless the OP has requested it. If you feel there is an issue with a Best Answer selection (incorrect information/mistaken selection/abuse of the BA system), please make use of the "Report Abuse" button on the post to alert a moderator to the problem.