Hello :) In order to learn the basics of coding, rather than thinking about why this is so, it is better to think, "There is a tool called this variable or function, and this tool is used in this situation." Understanding these principles requires you to know that it is computer science, so it is an advanced level of difficulty. If you remember the tools (functions) that I will teach you and follow other examples as well as my lectures, you will gradually get the feel for it! Thank you and have a good day :)