Javascript Tic Tac Toe doesn’t work at all

I’m new to JavaScript and I’m trying to make a tic tac toe game, but it’s not even doing anything, and I don’t know why. I tried to find solution, but I couldn’t.

I tried changing the content in “cellItems.forEach” in several ways but it didn’t work out.

const cellItems = document.querySelectorAll('.cell');

const winner = document.getElementById("winner");
let nextTurn = false;

let winningConditions = [
  [0, 1, 2],
  [3, 4, 5],
  [6, 7, 8],
  [0, 3, 6],
  [1, 4, 7],
  [2, 5, 8],
  [0, 4, 8],
  [2, 4, 6],
];

cellItems.forEach(cell => {
  cell.addEventListener('click', function() {
    turn(cell)
    checkWin();
  }, {
    once: true
  });
});

function turn() {
  if (nextTurn === false) {
    cell = 'X';
    nextTurn = true;
  } else if (nextTurn === true) {
    cell = 'O';
    nextTurn = false;
  }
};

function checkWin() {
  for (let winCondition of winningConditions) {
    if (winCondition.every(i => cellItems[i].innerHTML == "X")) {
      winner.innerHTML = "X won";
    } else if (winCondition.every(i => cellItems[i].innerHTML == "O")) {
      winner.innerHTML = "O won";
    } else {
      winner.innerHTML = "DRAW";
    }
  }
};