My go at the first Array challenge in JS Loops and Objects

I have followed a few good programming conventions such as declaring variables at the top of the screen, created the two dimensional array correctly and the for loop. I know how to iterate through an array, and a multidimensional array.

I followed the video solution in the end but this was my attempt

var numCorrectAnswers = 0;
var listCorrect
var listIncorrect;

//questions
var askOne;
var askTwo;
var askThree;


var quiz = [
  ["Who Wrote Harry Potter", "J.K. Rowling"],
  ["How many countries make up the United Kingdom?", "Four"],
  ["Who Wrote James Bond?", "Ian Fleming"]

];


for(var i=0; i<quiz.length; i+=)
{
  quiz[i][1]
}


function print(message) {
  document.write(message);
}

So I'm probably about half way there. This was me following everything I knew from the top of my head to do the challenge. When comparing it to the solution I can see that I declared my variables preparing them for the wrong reasons. I didn't even use the variables I made for the individual questions so I just lost heart and went to the video solution.

But I didn't really get how to use the variables to compare the input to the answers. It seems so simple when looking at the solution but I just didn't get it.

I also noticed in the solution that the quiz was only for number answers and my answers are strings, even the "number" answer.

What do you think about where I go from here? Try again or just study the solution more? Thanks. :)