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I have specific categorize and I want to create a menu from this specific categories with categories children and display product name.. example

Specific root categories
 subcategory
 product
 product
 subcategory
 product
 product
 product
 product
 subcategorie
 product
 product
 subcategory
 product
 product
 product
 product
 product
 subcategorie
 product
 product
 product
 subcategorie
 subcategorie
 subcategorie
 subcategorie
 subcategorie
 subcategorie
 subcategorie

en block class add

use MagentoFrameworkViewElementTemplateContext;
use MagentoCatalogModelCategoryRepository;
use MagentoCatalogModelCategoryFactory;

class Menu extends MagentoFrameworkViewElementTemplate

protected $categoryRepository;
protected $_categoryFactory;


public function __construct(
 Context $context,
 CategoryRepository $categoryRepository,
 CategoryFactory $categoryFactory
)

 $this->categoryRepository = $categoryRepository;
 $this->_categoryFactory = $categoryFactory;
 parent::__construct($context);


public function getParentCategorie($categoryId)

 return $this->categoryRepository->get($categoryId);


public function getSubcategories($categoryId)

 return $this->getParentCategorie($categoryId)->getChildrenCategories();


public function getCategoryName($categoryId)

 $category = $this->_categoryFactory->create()->load($categoryId);
 $categoryName = $category->getName();
 return $categoryName;


public function getCategoryProduts($categoryId)

 $collection = $this->_categoryFactory->create()->load($categoryId)->getProductCollection()->addAttributeToSelect('*')->addAttributeToSort('position', 'asc');
 return $collection;


/*public function getsubCategories($catId)
 $cat = $this->_categoryFactory->load($catId);
 $subcats = $cat->getChildren();
 $subcategories = array();
 foreach(explode(',',$subcats) as $subCatid)
 $_subCategory = $this->_categoryFactory->load($subCatid);
 if($_subCategory->getIsActive()) 
 $subcategories[] = array('id'=>$_subCategory->getId(),'name'=>$_subCategory->getName()); 
 
 
 return $subcategories; 
*/

 public function getCategory($categoryId)

 return $this->_categoryRepository->get($categoryId);

en phptml use

<?php $parent_category_id = 20 ?>
<?php $subCategories = $block->getSubcategories($parent_category_id) ?>
<b><?php echo $block->getCategoryName($parent_category_id); ?></b>
<ul>
 <?php foreach ($subCategories as $subCategorie): ?>
 <li><a href="<?php echo $subCategorie->getUrl() ?>"><?php echo $subCategorie->getName() ?></a></li>
 <?php if($subCategorie->getProductCount() > 0): ?>
 <?php $productCollection = $block->getCategoryProduts($subCategorie->getId()); ?>
 <ul>
 <?php foreach($productCollection as $_product): ?>
 <li><a href="<?php echo $_product->getProductUrl() ?>"><?php echo $_product->getName()?></a></li>
 <?php endforeach ?>
 </ul>
 <?php endif ?>
 <?php if ($subCategorie->hasChildren()): ?>
 <?php $childSubCategories = $block->getSubcategories($subCategorie->getId()); ?>
 <ul>
 <?php foreach ($childSubCategories as $childSubCategorie): ?>
 <li><a href="<?php echo $childSubCategorie->getUrl() ?>"><?php echo $childSubCategorie->getName() ?></a></li>
 <?php if($childSubCategorie->getProductCount() > 0): ?>
 <?php $childproductCollection = $block->getCategoryProduts($childSubCategorie->getId()); ?>
 <ul>
 <?php foreach($childproductCollection as $_item): ?>
 <li><a href="<?php echo $_item->getProductUrl() ?>"><?php echo $_item->getName()?></a></li>
 <?php endforeach ?>
 </ul>
 <?php endif ?>
 <?php endforeach ?>
 </ul>
 <?php endif ?>
 <?php endforeach ?>
</ul>