What are some low-cost options for reading OBD data?

Hi forum!

I drive a T4 TDi, manufactured in 1999.
I would like to discuss the existing diagnostic interface.
Read out any existing error codes and, if necessary, reset them.

Could this be done using a standard terminal program, or would something else be required?
Am I misunderstanding the complexity?

Thank you and best regards,

Eric.

Okay, I'm ready. Please provide the German text you want me to translate.