what to put in action="#" in the search form?

hello, I have downloaded the “crose”-template and some internal links are not set.
there is the html code:

<div class="searchForm">
                                <form action="#" method="post">
                                    <input type="search" name="search" id="search" placeholder="Enter keywords & hit enter...">
                                    <button type="submit" class="d-none"></button>
                                <div class="close-icon" id="searchCloseIcon"><i class="fa fa-close" aria-hidden="true"></i></div>

What do I have to set in instead of the hashtag?

Hey there

This is html template, you can use it as you wish, instead of hashtag you can use anything you need, link, email link or anything else, this is just an example