Trading the short side means that you have opened your trade using a sell order or ‘gone short’. This means that you expect prices to fall and will use a buy order to close your position.
Source:
https://www.dummies.com/how-to/conten...ding-cfds.html
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long side means buying the pullbacks in an up trend while short side means selling in a downtrend. there are many indicators that will help you identify a good trend and give you a sell/buy alert.
Source:
https://answers.yahoo.com/question/i...3022355AATumxr