AJAX IN MAGENTO2.HOW TO ADD information from form IN DATABASE?

I already have a form and controller action, that send data without using ajax.How to do it with AJAX? I would appreciate your help! view/frontend/templates/reviews.phtml <form action=”<?php echo $block->getBaseUrl().’reviews/index/save’; ?>” method=”post”> <label class=”label” for=”nickname”><span>Nickname</span></label> <input name=”nickname” id=”nickname” title=”nickname” value=”” class=”nickname” type=”text”> <label class=”label” for=”textreview”><span>Text Review</span></label> <input name=”textreview” id=”textreview” title=”textreview” value=”” class=”textreview” type=”text”> <button type=”submit” title=”Submit”…