It fueled a worry every content creator must have at some time. What if I don't know what the hell I'm talking about?

1. Do your research. Make sure you substantiate your central thesis with evidence (or well developed theory).

2. If you don't have time to do the research, don't sacrifice quality for quantity.

3. If you're wrong, admit it. Your ideas are not you. You should keep your ideas in a box outside of you. If you're ideas are wrong, change them, that is how you grow. Thank the person who called you on your bullshit or pointed out a logical flaw/citation error/etc.

EDIT:

Also, if someone ever attacks you, don't take it personally because it says more about them than it does about you. Whenever you disagree with someone, you disagree with their ideas. One of the things I like the most about hubski is that this is how discussion and arguments typically develop. People disagree, but no one gets personally attacked. Hopefully we can keep that environment because it is the environment within which great content creators can develop.