How to solve the problem with debian keys?

Question

Nginx

I execute sudo apt updatein the console on the Debian 9 server.
In the console it gives out:

If you look through the keys, that is, there are two overdue:


How to solve the problem?

Answer 1

curl -fsSL https://nginx.org/keys/nginx_signing.key | sudo apt-key add -

https://nginx.org/en/linux_packages.html#Debian