Hey @gerdboss

Here are some general tips:
1) Avoid touching your eyes, nose and mouth. Reason being - these are portals for micro-organisms from the environment (hitching a ride on your hands) to enter the body. 
2) Hand hygiene - this is essential, keep your hands clean by washing/ using sanitiser before meals and/or touching your face.
3) If you have a cough/sneeze, cover your nose/mouth with a tissue and dispose of it after. For the safety of those around you, wash your hands to keep them clean. You should wear a mask if you are having respiratory symptoms.
4) Observe for symptoms for 14 days - this is the incubation period for the virus, so be vigilant for the 14 days after you land for any symptoms, and have a low threshold to seek medical attention.

If you would like to read more about this, the WHO has a more detailed guideline over here: https://www.who.int/ith/2019-nCoV_advice_for_international_traffic-rev/en/

Hope this helps, and wishing you safe travels!