[rifung]

I'm not particularly senior so other people might be able to give you better answers. Nevertheless I would definitely recommend that you do a lot of reading. It really helps to know current technologies and more importantly understand why they exist.

You should also try your hand at developing with technologies that you don't know. It's of course useful and more scalable to read and learn about technologies out there, but actually using or implementing something with them brings your understanding to a higher level in my opinion. After all, you could know that technology X is better for something, but until you actually have gone through the suffering it was meant to solve and then used X to resolve it, you won't really understand it.