How to use custom commands in LibreOffice

LibreOffice is one of the most important pieces of free software, allowing many of us to work, study, and share information. Although the software features many tools and capabilities, the spectrum of possible uses for each and everyone out there is so wide, that it is simply impossible to cover every special need with hotkeys and shortcuts. However, LibreOffice can be set to support user-created commands that can essentially help us increase our productivity.