The concepts behind some things like React will last. I have seen several incarnations of GUI event frameworks and once you learn one, it is easier to learn oth

The concepts behind some things like React will last. I have seen several incarnations of GUI event frameworks and once you learn one, it is easier to learn others. That said, some technologies are fads that learning them for the sake of learning doesn't have a big payoff. I learned TCL at one job and have never used it again. There will always be things you learn for software development that proves to be dud. Get used to learning and be happy when something has long term success. It is vary hard to predict that the long term success will be.