The new ACME v2 protocol for Let's Encrypt certificates is live! Among other things, this now allows wildcard certificates to be obtained. This allows many individual certificates (such as subdomains) to be reduced to one, and no additional certificates are required for multiple subdomains.
Anyone who has already dealt with the security of the DNS protocol had to realize that it can be easily manipulated, monitored and censored without much effort. These censors are not only theory, but are already implemented by various countries. To cover these topics in the DNS protocol, several extensions were specified, such as DNSSEC with DANE/TLSA to detect man-in-the-middle attacks. The newest approaches in this area go a step further and encrypt the whole DNS traffic.