Creating your own ads.txt file allows you to control who can sell ads on your website and it's a practice highly recommended by Google.
Get started by creating an ads.txt file following Google's ads.txt guide.
Note: Your ads.txt file should look like this, where
pub-0000000000000000 is your own publisher ID:
google.com, pub-0000000000000000, DIRECT, f08c47fec0942fa0