command line reference for windows cmd, powershell, macos and linux bash. also includes oracle and sql server database commands.

the linux documentation project is working towards developing free, high quality documentation for the linux operating system. the overall goal of the ldp is to collaborate in all of the issues of linux documentation.

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.

friendly linux forum

provides instruction guides, how-tos, troubleshooting tips and tricks on linux, database, hardware, security, web and open source for both newbies and geeks – thegeekstuff by ramesh natarajan

the linux portal site

news and feature lists of linux and bsd distributions.

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.