Nice post and totally agree with you. Many simply jump into the market and buy into one cryptocurrency. Were that one asset to fail you would lose everything. It's all about spreading your risk.
The infographic you added is great too and all 5 points are great. I would add 3 more.
6 - Have a look at the charts
7 - Find good sources for crypto news and read it
8 - Read the white paper of ICO's you would like to invest in (and others if you really get into it)
Getting used to how a crypto reacts to the news can greatly reduce the chance of selling everything prematurely just to see the prices push for higher highs just because you panicked. You will also know what is being said about your assets. And the same goes for looking for chart patterns on the charts.
Reading the white paper will help you understand what the ICO would like to achieve and how it would like to achieve it. Granted you may not understand everything but as time goes by you will be able to compare one to another and you will learn a lot about cryptocurrencies.
Happy investing :)