tags-select.index.html

<select id="tags-select">
    <option value="политика" selected>Политика</option>
    <option value="музыка" selected>Музыка</option>
    <option value="спорт">Спорт</option>
  </select>
  
<p id="tags-text"><p>

tags-select.js

var tagsSelect = document.getElementById('tags-select');
var tagsText = document.getElementById('tags-text');
function handleTagsChange() {      
    tagsText.textContent = tagsSelect.value;
}

tagsSelect.addEventListener('change', handleTagsChange);