This is true for the newcomers like you which will help you to learn and as well get some experience. Buy and sell at short intervals regularly so that you will keep getting profits out and may not lose even if there is a big fall.
Also if you want to buy altcoin buy at PRE ICO and sell in a short time if you are getting good returns.
My strategy on investing involves only a simple method; which is only to buy bitcoins if it's less than ~$2000 and just wait. Like what happened like last July 17, 2017, the price of bitcoin went down up to $1955 and right now, it skyrocketed again up to $2380. The key here is to buy bitcoins if its price goes down especially this coming August 1 because of the hardfork and bitcoin split. Surely, prices will go down again and I see this as an opportunity to invest again. My strategy involves a huge amount of risk but it pays-off once I do it on the right time.