Answer 1

1. Don't put multiple languages in the tags, decide what you are going to use.
2. Array of arrays: Each element of this array is another array containing the values of that row.

For example:
[[1, 2, 3, 4, 5],
[1, 2, 3, 4, 5],
[1, 2, 3, 4, 5],
[1, 2, 3, 4, 5],
[1, 2, 3, 4, 5]]