Which book can help me understand supply and demand? Because i've read at several places that supply and demand move the market
Demand and Supply moves the market, but there are different types to analyzing this demand and supply itself, for example technical analysis, fundamental analysis and others.
Check out this thread, has a bunch of really nice books if you are looking to get started:
I believe that you want to trade just looking into the price action. You can study orderflow searching from the web.
If you are not looking to trade using the price action, as Nithin mentioned you need to look into different type of analysis.
Check out below article to predict market based on Supply and Demand:
One of the best sites and traders i have come across for Supply and Demand Trade setups.