What is reputation? How do I earn (and lose) it?
Reputation is a rough measurement of how much the community trusts you; it is earned by convincing your peers that you know what you’re talking about. Basic use of the site, including asking questions, answering, and suggesting edits, does not require any reputation at all. But the more reputation you earn, the more privileges you gain.
The primary way to gain reputation is by posting good questions and useful answers. Votes on these posts cause you to gain (or sometimes lose) reputation.
You can earn a maximum of 200 reputation per day from any combination of the activities below. Bounty awards, accepted answers, and association bonuses are not subject to the daily reputation limit.
You gain reputation when:
your account is verified: +20
your ask a question: +2
your answer a question: +5
your comment on question or answer: +2
your accept an answer for your question: +3
your answer selected as best: +15
your answer is voted up: +10
your question is voted up: +10
you give an up vote: 0
you give an down vote: 0
You lose reputation when:
your question is voted down: -2
your answer is voted down: -2
you place a bounty on a question: − full bounty amount
one of your posts receives 6 spam or offensive flags: −100
All users start with 0 reputation point. Accepting your own answer does not gain you any reputation. If a user reverses a vote, the corresponding reputation loss or gain will be reversed as well. Vote reversal as a result of voting fraud will also return lost or gained reputation.