Buy crypto when the price is low and sell when the price is high, I know this method is very common to some people, but is not common to newbies, make sure you buy when the price is low and hold for long term before you can sell when the price is high to maximize income. I will advice newbies to apply those methods to maximizing income from crypto investment.
It is what people want, but it's not a method at all.
Buy low and sell high is classic to get profit if you don't use margin or futures trading, you can not short, only can buy and sell. And with buy and sell, the only way for getting profit is "Buy low, sell high". It is same for investors and traders in this market, if they don't touch margin and futures trading that allows them to sell high, buy low through Short positions, and still get profit.
This is easy to say but difficult to execute, trust me. This way you are already trading and it's not that easy, it's difficult. Even professional traders can't easily do the "buy low, sell high". It always needed practice and being consistent or always having patience.
Everyone want to buy low and sell high because it brings profit, but it's hard to do. Because if everyone can do it, all will have profit, and the market is a zero-sum game, so there is no chance for everyone to have profit. If you have profit, I or others have loss, and winners are less than losers in a same market.