Where I come from they call Buy the Dip = Catching falling knives... 
You just have to make sure you catch it by the handle, otherwise it will cut you.
Trends never turn on a dime. Reversals build slowly. The first sharp dip always finds buyers and the first sharp rise always finds sellers.
Buy at support, sell at resistance. Everyone sees the same thing and they're all just waiting to jump in the pool
Market footprints and charts price in market expectations. If you follow the price action in the charts the footprints will guide you in the right direction.
Never chase the market in either direction, big moves usually show up in the charts before they happen. You the trader must read the chart and make your move based on that chart.
Traders who trade on emotion and opinion very often buy tops and sell bottoms, traders who react to market moves generally sell tops and buy bottoms. Successful traders focus on the chart and look for good entry points without emotion, that keeps them focused on where the market wants go not where they think the market will go. Keep your eye on the ball and the prize
Don't chase momentum if you can't find the exit. Assume the market will reverse the minute you get in. If it's a long way to the door, you're in big trouble