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As the name suggests, with OpenSource software the source (code) is accessible to everyone. Linux is an OpneSource operating system with a huge collection of software, which is also OpenSource.
Free of charge
Software for Linux is usually OpenSource and free of charge (there are exceptions). Around the globe many developers work on Linux in their spare time without pay (there are exceptions). Donations are a great way to support. Bigger software projects have professionalized the donations (association).
Open Source and secure
Linux has the reputation to be very secure.
Since it the source code is constantly inspected by hundreds of people all the time, errors become evident quickly and are also solved quickly. Once an error was detected, it if openly announced, the software gets updated and made available as fast as possible. Linux systems usually update automatically with special focus on security.
OpenSource applications invite people to join and contribute. If you are a developer, a designer, a texter / translater or tester … there's a lot to do and helping hands are welcome.
Perfect for education
Linux is popular in universites. Due to its openness, the principles can be understood clearer and unlock creative potential. By participating in an OpenSource project you will learn a lot from other epxerienced contributers.