I do not sit all day on the Internet and do not follow the price movement, I just look at how high the price of the coin is from the moment of purchase and decide whether it is profitable for me to sell it now.
Only those who are victims of day trading are bound to stay online all the time to sell of their coins at the best time of making maximum profit with their coins. Moreover it is not easy to read charts and decide accordingly the future of your coin. What I personally do is reading the history of coin before investing into it and sells off them when they are pumping.
The history of the coin as you say is historically growth and development of the coin, right? Or it is only history chart price. Because I usually check history price to create my strategy, it will help me know the move of the whales use for the altcoin I want to invest.