There's lots of things you can do with arrays.

To access a particular element of an array, use square brackets	MyArray[7]
To know the length of an array	MyArray.length
To search for the index of a particular element	MyArray.indexOf("orange")
To add a new item to the end of an array	MyArray.push("apple")
To fetch the last element of an array and remove it from the array	MyArray.pop()
To sort an array	MyArray.sort()

You don't need to remember all this, other than to know there's a powerful collection of methods available for use with arrays. You can find the full list at here and look them up when you need them.