The market is a bloodsucker, so adopt a system you are comfortable with and leave emotions at the door. I watch price and volume and aim for low risk entries. I don't pick exact tops/bottoms, I just want the cut in-between.
Professor of Physics and consultant to industry. 300+ technical publications. Believer in new technologies and identifying them early on. 75% portfolio buy and hold more than 3 months to years. 25% weekly swing trades all to the long side for fun.