Types are PascalCase:

const Person = struct {
    name: []const u8,
    age: u8,
};

Functions are camelCase:

fn addNumbers(a: i32, b: i31) i32 {
    return a + b;
}

Variables are lowercase with underscores:

const array_of_int = [5]i32{1, 2, 3, 4, 5};

File names and directories are snakecase. For files, there is an exception. When the file exists to The previous files.

some_dir/some_file.zig
some_dir/TypeName.zig