Linux has many useful applications. I use five applications every day. I use Openshot for video editing.
I use Vokoscreen for screencasting, I also use Libreoffice to create documents. In addition, I use screenshot to capture screenshots, and for vector graphics I use Inkscape.
If you’re interested in a structured course that teaches you the basics of Linux command line, I have created an online course at the URL below: Check out the course page description and the chapters provided.