I personally learned Zig by reading https://ziglang.org/documentation/master/ and stdlib source code once I joined TigerBeetle. enums.zig and meta.zig are good places to learn, in addition to usual suspects like array_list.zig.

(though, to be fair, my Rust experience was a great help for learning Zig, just as my C++ knowledge was instrumental in grokking Rust)