The most important thing to focus on when learning a new programming language is:

The most important thing to focus on when learning a new programming language is understanding its basic syntax and core concepts. This includes learning how variables, data types, conditional statements, loops, and functions work in that language. Once you have a solid foundation in the fundamentals, you can then build on that knowledge to explore more advanced topics and features specific to the language. Additionally, it is crucial to practice coding in that language and work on projects to gain hands-on experience and improve your skills.