Yes obcourse buy low and sell high is the golden rule in trading and in the way you can earn a good profit but not only that you can also learn more about crypto. When you doing trading you need to learn to control your emotions too to avoid loses.
Before going for trade, you need to learn so many things as knowledge is the only thing which can help you in the best possible way and that because of which, you can manage to make the right decisions at the right time. you need to look for the right coin for sake of trading and that you then need to hold that coin until and unless you are not having enough of the profit and that you dint think it to be the right time for selling.