yes it is true, Placement of TP, SL, determining lot usage and so on is already included in one package, namely risk management.
it's one of the things that must be mastered, the risk management package.
as a good trader we must know it and must continue to learn, one of which is learning from this forexzone forum, and getting knowledge about good trading methods, starting from Technical Analysis, Fundamentals, MM etc.
because if we know about the science of trading most likely is success and profit.
send regards for success.