Here are some sites that I personally prefer,

with courses and exercises to help you learn. : )  

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* https://www.sololearn.com/learn/languages/javascript

* https://www.studytonight.com/code/js-course/?ref=javascript-index

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// Example of a JavaScript coding practice exercise - Finding the maximum number in an array

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const numbers = [5, 2, 9, 1, 7];

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function findMaximumNumber(numbers) {

  let maximum = numbers[0];

  for (let i = 1; i < numbers.length; i++) {

    if (numbers[i] > maximum) {

      maximum = numbers[i];

    }

  }

  return maximum;

}

​

console.log(findMaximumNumber(numbers)); // Output: 9