Why is it important to use only reliable reference source when doing researsh on the internet?

Because it takes up space in stuff called liquid gas and matter

Because, as with this site, sometimes people don't really know the facts and are relying only on things they have heard. It is important even with reliable sites to check more than one place because sometimes people see things from different points of view and you will need to extract from that. As an example everyone knows about Paul Revere but very few know that a man named Israel Bissel actually rode farther and longer than Paul Revere to warn that the british were coming. Check it out. Type in Israel Bissel on google and you'll see what I mean.