Like in first comment every person should start from top 10 coins on market cap, first invest in some of them and only later invest in others. Now market is huge compared with past years, so many markets, pairs and coins. It's impossible to be sure in any investment this days, it's like gambling, you invest and wait, what happens happens. Before finding a coin to invest in, be sure in what you wish, how big profit and how long you are ready to wait. Bitcoin will bring double profit in next year or two, some coins can deliver x10, maybe we will see coins that can rise even more. I believe that just some coins will rise through period of one year, for some huge rises we need to be patient, maybe more than two years. Have some from everything is a good strategy, if you don't know in which coins to invest.
Recipe for disaster. Take a look at the top 10 altcoins (apart from Bitcoin) for the last 5 years and you will see this list changes every so often. If anyone took this advice last year, for example, you would be buying Ethereum and Litecoin and Ripple. And look where they are now.
There's no fixed strategy or pattern. Invest not by numbers and promises. Invest in your research and believe in it.