Wordpress Menu Problem

!-- Mobile Menu Desktop --
div class=show-mobile
    div class=site-menu
        ul class=menu
        lia href=#Link/a/li
            lia href=#Link/a/li
            lia href=#Link/a/li
                ul class=dropdown-menu
                        lia class=dropdown-item href=#Link/a/li
                        lia class=dropdown-item href=#Link /a/li
                        lia class=dropdown-item href=#Link/a/li
                        lia class=dropdown-item href=#Link/a/li
                        lia class=dropdown-item href=#Link/a/li
                        lia class=dropdown-item href=#TLink/a/li
                    /ul
            /li
            lia href=#Link/a/li
            lia href=#Link/a/li
            lia href=#Link/a/li
            lia 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
lia href=#Link/a/li
lia href=#Link/a/li
lia href=#Link 
/a
    ul class=dropdown-menu
        lia class=dropdown-item href=#Link/a/li
        lia class=dropdown-item href=#Link /a/li
        lia class=dropdown-item href=#Link/a/li
        lia class=dropdown-item href=#Link/a/li
        lia class=dropdown-item href=#Link/a/li
        lia class=dropdown-item href=#TLink/a/li
        /ul
/li
lia href=#Link/a/li
lia href=#Link/a/li
lia 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/iamp;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.**