How do I learn about a potential market I am looking to buy in.

[Rosemary Novak]

I have been doing real estate research for a few weeks now and I keep coming across the phrase "know you market". I understand that 'your market' is where you are buying or selling real estate. I want to know what I need to research about the market I want to purchase in. I have a list already of the main things I want to look into ( Crime, rent prices, nearby schools, new or planned expansion of infrastructure in the area, and value of homes in the area). But please comment anymore things I need to research before buying in a particular market. Also feel free to add your own stories and suggestions as to what you do when looking to purchase a new investment property.