There's a lot out there for sure but a lot of it is also fairly established. I agree with Kristian here that with your set of languages it shouldn't be hard to

There's a lot out there for sure but a lot of it is also fairly established. I agree with Kristian here that with your set of languages it shouldn't be hard to get into, personally I found "You (still) don't know JS" a great introduction, even if you read just the first few volumes and if typed JS is your thing the TS docs should get you going. I you're keen to stay server-side, NestJS could be interesting, its picking up a lot of steam, otherwise the ReactJS docs are as good as anything to get going in the front-end. Honestly just play around and try not to let the size of the landscape get to you. Unlike some JS devs seem to believe, you don't need to know everything about everything to get going.