For learning how to code, you are perfectly fine on Windows. You are going to read lots of technical arguments in here about why you should use Linux or a Mac.

For learning how to code, you are perfectly fine on Windows. You are going to read lots of technical arguments in here about why you should use Linux or a Mac. You are learning how to program, so once you progress outside of an editor and compiler and want to learn more about a certain specialty you may want to investigate things related to that specialty. The reason Linux is used a lot is that a lot of software development is writing web applications which typically run on Linux on servers. You can explore Linux on your Windows machine using tools like VirtualBox to create a virtual machine running Linux. You don't need to dual-boot, reformat your system, or spend any money to learn it. What flavor of Linux should you learn? It doesn't matter for just starting out. You could post a question and get lots of technical arguments about one vs the other. For a lot of technical topics, the same concept applies - you are in a learning phase, pick a common one (programming language, operating system, etc.) and learn using that. Once you reach a comfort level and feel confident you can "get things done", investigate differences between what you learned and other options out there.