Create a product by installer in magento2

To create a product by installer you need to add file “InstallData.php” at path:

app/code/Webkul/Hello/Setup/InstallData.php

<?php

namespace Webkul\Hello\Setup;
use Magento\Framework\Setup;
class InstallData implements Setup\InstallDataInterface
{
    protected $storeManager;
    protected $productFactory;
    protected $productModel;
    protected $_objectManager;
    protected $productType = \Magento\Catalog\Model\Product\Type::TYPE_VIRTUAL; //set the type of product

    public function __construct(
    	\Magento\Catalog\Model\Product $productModel,
    	\Magento\Store\Model\StoreManagerInterface $storeManager,
    	\Magento\Framework\ObjectManagerInterface $objectManager,
    	\Magento\Catalog\Model\ProductFactory $productFactory
    	)
    {
    	$this->productModel = $productModel;
    	$this->storeManager = $storeManager;
    	$this->_objectManager = $objectManager;
        $this->productFactory = $productFactory;
    }

    public function install(Setup\ModuleDataSetupInterface $setup, Setup\ModuleContextInterface $moduleContext)
    {
    	$appState = $this->_objectManager->get('Magento\Framework\App\State');
	    $appState->setAreaCode('adminmhtml');
        $product = $this->productFactory->create();
        $attributeSetId = $this->productModel->getDefaultAttributeSetId();
        $product->setStoreId(\Magento\Store\Model\Store::DEFAULT_STORE_ID); 
        $product->setWebsiteIds([$this->storeManager->getDefaultStoreView()->getWebsiteId()]);
        $product->setTypeId($this->productType);
        $product->addData(array(
            'name' => 'Sample product',//name of product
            'attribute_set_id' => $attributeSetId,
            'status' => \Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_ENABLED, 
            'visibility' => \Magento\Catalog\Model\Product\Visibility::VISIBILITY_NOT_VISIBLE, 
            'weight' => 1,
            'sku' => 'sample_product',//SKU of product
            'tax_class_id' => 0,
            'description' => 'sample_product',
            'short_description' => 'sample_product',
            'stock_data' => array( //stock management
                'manage_stock' => 1,
                'qty' => 999, 
                'is_in_stock' => 1
            )
        ));
        $product->save();
    }
}

Here,

\Magento\Catalog\Model\Product\Type : is used to access type of product.

$this->productModel->getDefaultAttributeSetId(): used to get get default attribute set id

\Magento\Catalog\Model\Product\Visibility : used to get visibility of product

\Magento\Catalog\Model\Product\Attribute\Source\Status: used to get status of product

$this->storeManager->getDefaultStoreView()->getWebsiteId(): used to get website id.

\Magento\Store\Model\Store: used to get store id

setAreaCode('adminmhtml'): used to set "admin" as an area code.

After that, you just need to run upgrade command, and your product is created in your site.

Upgrade command: php bin/magento setup:upgrade