The best time is if you have the capital investment, you know the basic, the do's / don't and that's all about it. You're on your way of becoming well seasoned trader.
depend on the type of trade the op is talking about. Buy a particular coin such as bitcoin, you we need to study price action. You should always buy at a lowest price possible and sell at a highest price possible.
But platform based a steady must be less than 20% of our skill development for a better trading and the remaining 80% must the same across any type of trading.
To trade bitcoin we must have some in-depth knowledge about its price swing patterns. But that alone will not get you the best time to trade, a strong skill on price predicting capability must decide the best time to be trader.