https://ytdl-org.github.io/youtube-dl/index.html

Optimize your YouTube thumbnails with these dimensions: 1280 pixels wide by 720 pixels tall, with a minimum width of 640 pixels. A ratio of 16:9 is ideal as it’s used most often in YouTube players and previews.

https://superuser.com/questions/15596/automatically-run-a-script-when-i-log-on-to-windows

https://www.akamai.com/our-thinking/threat-advisories/memcached-ddos-explained

https://wiki.vpsget.com/index.php/Iptables_example_block_all_except_specified

https://www.openproject.org/docs/installation-and-operations/misc/docker-postgresql-migration/

https://www.openproject.org/docs/development/development-environment-ubuntu/

https://www.atlantic.net/vps-hosting/how-to-protect-apache-and-ssh-with-fail2ban-on-centos-8/

https://project-awesome.org/#platforms

https://jitsi.github.io/handbook/docs/devops-guide/devops-guide-docker

https://openmeetings.apache.org/#apache-openmeetings—features-and-overview