The interaction of price and volume can be readily interpreted by the application of common sense. I have taught myself to successfully trade simply by " reading" the price / volume story from the live bar chart of any particular stock.
Simply by looking at the up bars, down bars, opening and closing levels on each bar and the related volume levels, I am able to trade with a very high percentage of success.
I do not consciously look for chart patterns, support, resistance etc. I just trade what I see in the unfolding story which appears before my very eyes.
I did read " Principles of Tape Reading" by Graifer & Schumacher though plus some threads on this website related to Price and Volume.
I took the knowledge, twisted it around a few times to suit my style and applied it successfully in my trading.
Price and Volume is nearly everything imho but the understanding of it is no big deal and should not be made unnnecessarily complicated .