RSI divergences are KEY for me. I'll post some charts later sometime, showing how they are great warning signals.
I basically wait for RSI divergences to enter trades. About 70% of my trades are based on that. Price falls / RSI rises, along a trend.
These thoughts are just mine, not right, not wrong, just thoughts. Invest in what you believe in, not what I believe in. Do your research, and invest in the facts.