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spinics.net is mostly mailing list archives these days

stack overflow is the largest, most trusted online community for developers to learn, share​ ​their programming ​knowledge, and build their careers.

linuxquestions.org offers a free linux forum where linux newbies can ask questions and linux experts can offer advice. topics include security, installation, networking and much more.

q&a for ubuntu users and developers

github is where over 100 million developers shape the future of software, together. contribute to the open source community, manage your git repositories, review code like a pro, track bugs and features, power your ci/cd and devops workflows, and secure code before you commit it.

site header page.

reddit is a network of communities where people can dive into their interests, hobbies and passions. there's a community for whatever you're interested in on reddit.