Buy and hold died. Follow the gurus cautiously. Some are blind. Buy dips. Buy momentum. Market is unknowable. Food always in demand. Energy too. Charts are like statistics: they can say whatever you want. Momentum + price action for swing trading.
I focus on identifying and getting long undervalued or little known prospective momentum plays and on going short when hype and exuberance has caused an equity to far exceed a 'rational' valuation by traditional metrics.