How did you choose the currency pairs that you trade?

I love to practice on a demo account. To begin, I evaluate whether or not a currency pair performs well on a demo account. Only then do I add a currency pair to my live trading.
I prefer trading EUR/USD.

At certain times of day, currency trading in a given currency pair is especially busy when any two trading sessions overlap. This is the busiest time of day for transactions, and gives traders great opportunities for trading. The forex market is busiest when the NewYork session and London session overlap. Maximum trading transactions take place at this time.

should use the major pairs. There is much movements in those

I trade with the EURUSD currency pair, I prefer them because most traders use the EURUSD because of its low volatility, and I trade with FP markets, which provides lower spreads in EURUSD for most parts of the day, which is suitable for me.

What do you mean by these?