Here are a few of the SPDRs which are probably the best sector funds to watch -
Energy - XLE

You can pick out the cross overs for yourself - you can see - once you get the cross over in most instances it would be a good idea to start picking up some of the underlying stocks.
Here's XLF

This one had a long run after the composite cross over last July.
And finally XHB - the homebuilders

Last November there was that brief flurry of activity that lasted for several months. You can bet I'll be watching this one for the next cross over.
That will do it for now in our easy swing trading series - the point and objective is to get you thinking in different time frames in order to make better profits.