With dozens of world currencies, there are far too many possible currency pairs for anyone to keep track of mentally
. Forex charts show at a glance what any currency pair is up to, and good software allows you to save multiple charts as "favorites." Naturally you'll want to keep an eye on the charts representing investments you've already made, and it's smart to have a few additional ones saved, too, so you can watch for trends in currencies you haven't traded yet. You never know when a lucrative new opportunity is going to be revealed.