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Credit rating in Germany
The SCHUFA explicitly says on their website that their scoring system is a secret. However, if your goal is to be credit-worthy for example to get financing for a house or a car or whatever, just pay any loans and your credit card back on time and you'll be fine. There is no need to build a credit history. I just got a mortgage on a new house without any real credit history. I have one credit card which I only use on vacations because some countries don't take my debit card, and I always put money on it before I use it, so I've technically never borrowed money from a bank at all. My banker looked at my SCHUFA with me and we saw that there was nothing in there except for the credit card, which has a 500€ limit and if I maxed it out, the monthly interest would be 6,80€ so he added that 6,80€ to my expenses calculation and that was it. If you're having trouble getting a loan and you don't know why, you can ask the SCHUFA for the data they have on you and you can correct any mistakes they might have made. Sometimes, especially when you have the same full name and birth date as somebody else, the SCHUFA does get things mixed up and you have to sort it out.