There is a ton of valuable advice about buying real estate, whether it is online or off. Location is still king and buying a property to hold it long term is a valid theory. But buying the worst house in the best neighborhood is not good advice.
The old way of thinking was that a home in a really good neighborhood was a solid investment. Buying the worst home in the best neighborhood would be an even better investment. Over time, as the rest of the area continued to appreciate in value, the worst home would also appreciate and provide a huge gain to the owner.
Lots of research, and basic math, have shown this theory to be an overall bad idea. Understanding why you should avoid the worst home, and what to do in its place, is a much better way to spend your time and money.