To expand, the software industry moves fast, and you have to keep learning to stay afloat, or risk stagnating and ending your career early. look at where software was at 5 or 10 or even 20 years ago. There was no react and no rust 20 years ago, nor was there even git! Whatever you know now is going to be out of date in a matter of years. good luck getting a job if that's all you ever want to learn.