I think you misunderstood where I am coming from. I see many newbies trading both long and short all day long, trying to capture these short term moves, and I see few having any kind of success over a long period of time.
The stock market in general has a very long term, upward bias. Therefore, just by playing the long side alone, you have at least a tiny edge in your favor.
In regard to developing a bias for the day, I refer to the work of Toby Crabel, Mark Fisher and similar traders who employ quantitative methdologies to develop a bias for the day.
Once you develop a bias for the day, then employ a strategy to exploit that bias. Some days it will work, other days it won't, but over the long run, you should come out ahead, assuming you've done your research and have developed a sound entry and exit strategy along with proper risk management.
I'm afraid that I must disagree again. Yes, we've been in an uptrending market for six years now. But the countermoves could have been and probably were for at least some traders devastating. If one is trading a weekly chart then, yes, think long. But the weekly trend has little significance to the intraday.
All that aside, you're one of the few people I read, so I hope you don't take this as any sort of personal attack.