Hi NVP
This link may help to introduce newbies to what corelation is, and which pairs it affects.
For example, if you are position sizing using 2% of your account, you would not want to be long the EURUSD and at the same time short the GBPUSD.
Nor would you want to be long or short both pairs simultaneously.
In the first scenario, you are negating your bet.
In the second scenario. you are doubling your bet.
There are other pairs notable for the same behaviour (ie: correlation).
Lately the EURUSD and USDCHF have been mirror images of each other - anti-correlation, if you like.
Correlation is something every FX trader needs to be aware of, to avoid such clashing, unless trading in a more sophisticated manner.
As for the interesting points you have raised ... speed on!
Currency Pairs Correlation in Forex Market: Cross Currency Pairs
There are possibly other good sites discussing correlation - I would love to have an opportunity to visit some of them, if anyone has links.