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To insert new elements into the beginning of the parent using the DOM, you can use the following steps:

1. Get the reference of the parent element using any of the DOM selectors, such as getElementById() or querySelector().

2. Create a new element using the createElement() method.

3. Set any attributes or content for the new element using the appropriate methods, such as setAttribute() or textContent.

4. Use the insertBefore() method on the parent element to insert the new element at the beginning of the child elements. This method takes two arguments - the new element to be inserted and the reference to the element before which it should be inserted. In this case, you can pass parentNode.firstChild as the second argument to insert the new element at the beginning.

Here's an example code snippet that demonstrates the above steps:

// Get reference to parent element
const parent = document.querySelector('#myParentElement');

// Create a new element
const newElement = document.createElement('div');

// Set attributes or content for the new element
newElement.setAttribute('class', 'newClass');
newElement.textContent = 'This is a new element';

// Insert the new element at the beginning of the parent
parent.insertBefore(newElement, parent.firstChild);