When was the last time you had to create a zip file? Personally, I have to interact with those types of files all the time (either receiving or sending them to various clients, family, and friends).
There are a number of ways that you can create PDFs on a Linux system. You can use an application like LibreOffice or OpenOffice, or you can take advantage of any of a number of commands that can ...
Symbolic links (also called a soft link) are a very important tool to understand in Linux. These are special files that point to other files, similar to shortcuts in Windows or aliases in macOS.