You're going to look pretty stupid if you're talking about something but you suck at providing sources for your claims. So don't do that. Always provide sources for serious discussions if what you claim is supposed to be factual and not just an opinion.
Example of a fact (These require sources!):
"The national debt is still rising." / "The national deficit is falling." (Source)
Example of an opinion (These don't require sources, but sources still help support your opinions.):
"We spend too much money on defense funding." / "We don't spend enough money on NASA."
For more assistance, follow this guide.
http://wps.pearsoncustom.com/pls_125664 ... index.html
Remember, the burden of proof lies on you. Telling people to "do your research" without providing material for them to read, or telling them to "Google it" is going to be considered trolling and I will ban you from using this part of the forum.