This is a very good piece of advice that you should always remember. Unfortunately, there are so many people out there that do not understand the fact that not everything that is written on the internet is correct. In fact, we can say that most of the articles that are written online are basically filled with bad information. This is also something that we notice with financial blogs. Since anyone can open a blog, it is quite easy to end up on sites that do not have good information. You need to only trust sites like http://www.aghora.org/ and in order to identify the good resources, you need to basically stay focused on the overall authority of the blog.
When analyzing authority, the most important factor is the experience of the person that actually wrote the article that you read. This counts a lot since you want to be sure that the articles on that particular financial blog are offered by someone that really knows what he/she is talking about. Unfortunately, too many individuals with low experience give bad advice online. If you see that the person is well respected in the industry, you can trust everything that he says and you did find a good information source.