Disc golf is played according to the international rules of the PDGA (Professional Disc Golf Association). The set of rules is quite comprehensive and is supervised by a special PDGA committee and is adapted from time to time if necessary.
Further rule adjustments are underway for 2024. The changes can be read here (English). The following links lead to the German editions 2023.
For major tournaments, participants are required to have passed the PDGA “Certified Official” exam. This is valid for three years and costs 10 dollars.