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.
Yes, since you are new here and it is good that you got the basics right but you know what is the biggest problem is ? It is actually finding the cheapest price of coin and then the maximum price. Sometimes even the owners cannot determine the pump and dump of a coin against some big investors.
That is right, Know the basics first so you will have a great foundation in your trading experience because even though it is just a basic knowledge it is one of the foundation to be a great trader. Pump and dump of a coin can possible determine by reading updates for that particular coin example is the bitcoin then also studying the trading history and also understanding the candlestick that may show pattern which can help you to gain profit or determine if the coin will dump or pump.