Tabs stopped working when moving the site to WordPress. What is wrong in the code?

Question

Web development

When laying out the site, the tabs worked fine, but after the transfer, the tab switch stopped working (only the content of the first page is visible, and the rest of the content does not appear when you click the tabs). What could be the reason?

The code

<section class="video">
      <div class="container">
        <div class="row">
          <div class="col-xl-12">
            <ul class="nav nav-tabs" id="myTab" role="tablist">
              <li class="nav-item">
                <a class="nav-link active" id="easy-tab" data-toggle="tab" href="#easy" role="tab" aria-controls="easy" aria-selected="true">Easy</a>
              </li>
              <li class="nav-item">
                <a class="nav-link" id="middle-tab" data-toggle="tab" href="#middle" role="tab" aria-controls="middle" aria-selected="false">Middle</a>
              </li>
              <li class="nav-item">
                <a class="nav-link" id="long-tab" data-toggle="tab" href="#long" role="tab" aria-controls="long" aria-selected="false">Long</a>
              </li>
            </ul>
          </div>
        </div>
        <div class="tab-content" id="myTabContent">
          <div class="tab-pane fade show active" id="easy" role="tabpanel" aria-labelledby="easy-tab">
            <div class="row video-tab">
              <div class="col-xl-4">
                <img src="/wp-content/themes/lemon/img/card-recipe/card-pecipe.png" alt="">
                <h3 class="video-title">
                Bananas Foster Ice Cream Cake
                </h3>
              </div>
              <div class="col-xl-4">
                <img src="/wp-content/themes/lemon/img/card-recipe/recipe-6.jpg" alt="">
                <h3 class="video-title">
                Quiche with broccoli with cheese
                </h3>

              </div>
              <div class="col-xl-4">
                  <img src="/wp-content/themes/lemon/img/card-recipe/recipe-6.jpg" alt="">
                  <h3 class="video-title">
                  Fried cauliflower with lemon
                  </h3>
              </div>
            </div>
          </div>
          <div class="tab-pane fade" id="middle" role="tabpanel" aria-labelledby="middle-tab">
            <div class="row video-tab ">
              <div class="col-xl-4">
                <img src="/wp-content/themes/lemon/img/card-recipe/card-pecipe.png" alt="">
                <h3 class="video-title">
                Bananas Foster Ice Cream Cake
                </h3>
              </div>
              <div class="col-xl-4">
                <img src="/wp-content/themes/lemon/img/card-recipe/recipe-2.jpg" alt="">
                <h3 class="video-title">
                Quiche with broccoli with cheese
                </h3>
                </div>
                <div class="col-xl-4">
                  <img src="/wp-content/themes/lemon/img/card-recipe/recipe-3.jpg" alt="">
                  <h3 class="video-title">
                  Fried cauliflower with lemon
                  </h3>
              </div>
            </div>
          </div>
          <div class="tab-pane fade" id="long" role="tabpanel" aria-labelledby="long-tab">
            <div class="row video-tab ">
              <div class="col-xl-4">
                <img src="/wp-content/themes/lemon/img/card-recipe/card-pecipe.png" alt="">
                <h3 class="video-title">
                Bananas Foster Ice Cream Cake
                </h3>
              </div>
              <div class="col-xl-4">
                <img src="/wp-content/themes/lemon/img/card-recipe/recipe-7.jpg" alt="">
                <h3 class="video-title">
                Quiche with broccoli with cheese
                </h3>
                </div>
                <div class="col-xl-4">
                  <img src="/wp-content/themes/lemon/img/card-recipe/recipe-7.jpg" alt="">
                  <h3 class="video-title">
                  Fried cauliflower with lemon
                  </h3>
              </div>
            </div>
          </div>
        </div>
      </div>
    </section>

Answer 1

Give a link to the site, cents for 90 troubles with paths to scripts

Answer 2

Look for 404 errors in the browser console, draw conclusions.
The most common:
The console will give an unambiguous answer, what is wrong.