How I invest without risking financial stability

A common piece of advice that just about anyway getting into investing would hear is:

Don't risk more than you are OK with losing completely.

The idea is that if you have $10,000 in the bank, what percentage of this amount would NOT hurt if you lost it on a risky venture? $1000? $2000? That's how much you should invest, and no more.

That will, of course, differ based on individual risk appetite, but when it comes to managing finances for long-term growth and prosperity, you need a system that you stick to religiously.

Me?

I use a simple 10% rule.

Ten percent of monthly income goes toward investing. Every. Single. Month.

That 10% of whatever I've earned this month can be invested wherever, including long-holding cryptocurrencies, ICOs, day-trading cryptocurrencies, bonds, stocks, ETFs, and index funds.

So one month it may be buying and holding some BTC and ETH. Another month, it could be buying ETH for exchanging into that month's hot ICO tokens. A third month could be buying some more TSLA stock (go Elon!) or a clean-energy focused ETF.

What's your sustainable, low-risk financial growth system?

I'd love to hear your ideas and practices, and to share knowledge.