The way I learn new languages nowadays is 1. Look at example 'Hello world' code 2. Attempt a problem on Project Euler 3. Look at docs/source code to get what

The way I learn new languages nowadays is 1. Look at example 'Hello world' code 2. Attempt a problem on Project Euler 3. Look at docs/source code to get what I'm missing 4. Repeat Julia docs are good for step 3. I don't think there are many super technical books like the one you're looking for, since Julia doesn't really have an industry that would produce them, and since the core is still being developed and all that.