Investing is a numbers game from start to finish. We all know that on some level, but let's take a minute to really think about it, like: Moreover, each of those considerations can be broken up into another set of questions - each of which requires even more knowledge of numbers. I can't give you advice about how much money you should invest. For one thing, it's illegal. For another, it would be unethical since I don't know your personal ins and outs. Likewise, I can only make general suggestions about how many assets you should own.