There are 2 components to profitability:

Psychology & edge. 

Some have one down, and not the other. You need both to be CONSISTENTLY profitable. 

You won't make money not knowing what your edge is. 

You also won't make money consistently, not knowing how to properly execute your edge.

Need to know how to do both. Find a trade, and execute it properly. Once you get it down, that is when your consistency comes in.