Wordpress Menu Problem

Question

<!-- Mobile Menu Desktop -->
<div class="show-mobile">
    <div class="site-menu">
        <ul class="menu">
        <li><a href="#">Link</a></li>
            <li><a href="#">Link</a></li>
            <li><a href="#">Link</a></li>
                <ul class="dropdown-menu">
                        <li><a class="dropdown-item" href="#">Link</a></li>
                        <li><a class="dropdown-item" href="#">Link </a></li>
                        <li><a class="dropdown-item" href="#">Link</a></li>
                        <li><a class="dropdown-item" href="#">Link</a></li>
                        <li><a class="dropdown-item" href="#">Link</a></li>
                        <li><a class="dropdown-item" href="#">TLink</a></li>
                    </ul>
            </li>
            <li><a href="#">Link</a></li>
            <li><a href="#">Link</a></li>
            <li><a href="#">Link</a></li>
            <li><a href="#">Link</a></li>
        </ul>
        </div>
    </div>
    <small> Copyright 2022</small> </div>
</aside>
<nav class="navbar">
<div class="container">

<!-- Desktop Menu -->
<div class="logo"> <a href="#"><img src="<?php bloginfo('template_url');?>/img/logo.png" alt="Image"></a> </div>

  

<div class="site-menu">
<ul class="menueffect">
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
<li><a href="#">Link 
</a>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Link</a></li>
        <li><a class="dropdown-item" href="#">Link </a></li>
        <li><a class="dropdown-item" href="#">Link</a></li>
        <li><a class="dropdown-item" href="#">Link</a></li>
        <li><a class="dropdown-item" href="#">Link</a></li>
        <li><a class="dropdown-item" href="#">TLink</a></li>
        </ul>
</li>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
</ul>
</div>
<div class="hamburger-menu"> <span></span> <span></span> <span></span> </div>
<div class="navbar-button"> <a href="#"><i class="flaticon-call"></i>&amp;nbsp;&amp;nbsp;&amp;nbsp;123 456 789</a> </div>
</div>
</nav>

Hello,

I want to create a menu structure like this. For the first time, I will set up a theme with Wordpress. There is a place where I hang out. How can I define these menus with php code. I tried a lot but I keep getting errors. I'm waiting for your help.**