There are many different metrics you can use to determine how well you’re doing financially. One of the most effective for determining credit worthiness (and most commonly used by lending agencies) is the debt to income ratio or DTI ratio.
In a perfect world, the ideal debt to income ratio would be 0% (absolutely no debt).
However, for most of us, that’s not realistic as there are large expenses that we couldn’t fund in a reasonable amount of time without the use of credit. These include mortgages, small business loans, etc.
Just because we have access to credit and need it (arguably) for large purchases, you shouldn’t abuse it. Checking a few key metrics like your net worth and debt to income ratio can give you a quick snapshot of how you’re doing handling credit.