If you are starting out with the Raspberry Pi and class yourself as a beginner then the NOOBS Raspberry Pi OS is a great place to start.
Instructional videos are also included detailing how to install and setup the various OSes, allowing you to quickly choose which Raspberry Pi OS is best for your project.
To fully functional desktop replacements using the powerful Raspberry Pi 4 mini PC, as well as as few more specialist Raspberry Pi OSes. Here we compliled a list of popular operating systems for the Raspberry Pi range of single board computers, providing a quick insight into what you can expect from each and how you can use it to build a variety of different applications from games emulators. There are a wide range of different Raspberry Pi OS packages available and choosing the correct one for your hardware, application or project is not always easy.