* Bad debt: This is what makes a person suffer, because it is the things that give us liabilities or the ones that decrease in value, such as gadgets and cars. And the common problem with these loans is that you will pay them with high interest.
* Good debt: this is the type of debt that will make a person rich. Or else you will also earn money because, instead of using it for your needs, you will use it to build an asset. Which, if you handle it properly, can give you extra income.
It's true, there are definitely two types of debt, the good and the bad. I would make the classification a bit different, bad debt is the one that we use for consumption. It doesn't provide any additional value for us except a quick boost in consumption, but it won't make our long-term outlook better. The good debt on the other hand is going to create income and returns in the future that will make our situation better. In most cases I think that debt is unnecessary and should better be avoided, but there are also situations where using debt is unavoidable. For example, when buying a house or apartment the majority of people will be unable to make the purchase from their savings alone. For such a large purchase which we only make a few times in our lives we need to use debt. The debt in such a case should always be consider in relation to the benefit we get from it. With our own apartment we would save on paying rent which we then can afford to pay back our loan. So, we should be only using debt if we get something from it and if there is a benefit in the future. The only exception would be if we need money for a medical treatment, health is everything and comes before money.