I have just finished Think Julia, which was a pretty good introduction and is available for free online: https://benlauwens.github.io/ThinkJulia.jl/latest/book.html Its a little slow for seasoned programmers, but it has a lot of exercises and the idiomatic julia parts tend to stick out more with the simple 2 line snippets.

The best place to start is this list of resources: https://julialang.org/learning/

Excluding the university course listings, I think most of the resources there should be up-to-date (post Julia 1.0).

Once you have a basic feel for the language, the forum (discourse.julialang.org) and Slack are both very welcoming.

Thanks a lot!