The language docs are OK: https://ziglang.org/documentation/master/
Zig taught me to read stdlib source, which I do at my $dayjob now too.
It is perfectly fine to read stdlib source. Start with lib/std/mem.zig after reading the docs about the language.
It is much more readable than the C "docs" ISO/IEC 9899:2011. I am so productive now. :)