To be a financially successful person you have to work really hard and there is no way around it. You have to give at least 40 to 50 hours a week to earn an active income. But what if I told you that you can also earn while you sleep? Too good to be true right? But it is true, though it requires a little bit of your time, but again everything worthwhile requires time. You can dedicate your free time into earning passive incomes. What is a passive income, you ask? Passive income is any source of income where you do not take part actively but do it on a less regular basis, like in your free time which continues to earn money for you even while you sleep. To have a strong financial foundation, having more than one income source is very essential. You can read it in every financial book or hear it from every great investor that having more than one source of income is of the vital importance.