First of all, let me introduce myself. I am a seventeen years old Canadian and I invested everything I had into crypto 6 months ago. My investment strategy was composed of two main strategies.
Strategy #1: first you go to coincap.io and you click on %24hr button two times. 
It will show you the coin that had the biggest drops in value in the last 24 hours. What you want to search for when you follow this strategy is coins with the biggest drop but also with the best rank (the number on the left of the coin's name). My personal preference is to pick only the coins that have a better rank than 50 so for example rank 50,49,48,47 etc. You can choose this depending on your risk tolerance but I feel like 50 is a good number. You can compare different coins by dividing their %change by their rank# and the coin with the highest value is the best one to invest in. Don't choose to invest in a coin just by this number, you also need to make sure that the drop isn't caused by something really important. If the drop in price can't be explained by any news or event, this is a good coin to invest in but you also need to do some research into the coin to know if you support their project and READ THE WHITE PAPER! Make sure you understand the vision of the coin and everything before putting any money into it.
My second strategy is to diversify your portfolio into two main categories. The coins that follow the price of bitcoin and the others that don't. I personally prefer to have more coins that follow Bitcoin price and this is even truer since Bitcoin got things sorted out and is at $3247. The coins I use to balance my other coins that follow Bitcoin's path are mainly master nodes coins. They tend to go up in value when bitcoin goes down.