In response to a comment, here is one thing  what I look for to increase my odds of success. ISRG is weak after a strong run yesterday. Has dropped down today and consolidated. Probability said down so I shorted it at the price indicated at the lower green line. Lower red line was my stop . I don't know where fib lines or other support / resistance levels are. I only care what the momentum does and will take my loss if it hits my stop level or take profits when it stalls or when it would be foolish not to take it. I never have a preset idea of my "profit" as that could commit my mind to thinking that I know what it will do. I never know what a stock will do.