Ask HN: Decent book/tutorials for writing browser games?

Any books or tutorials for speeding up my development? My day job is Java, backend and algorithms. I have done some simple JS exercises.

My aim is a strategy-type multi-user browser game. Very simple graphics. I am not yet sure if I want to do the backend in JS or java. Any advice ?

BTW, I already have a small community of users willing to pay and subscribe, so I am trying to get an MVP up and running.