In Magento 2, you can retrieve the store ID using various methods depending on the context in which you need the store ID.
Here are a few common ways to get the store ID:

1. Using the Store Manager:
You can use the Store Manager interface (`\Magento\Store\Model\StoreManagerInterface`) to retrieve the current store ID. Here’s an example:

“`php
use Magento\Store\Model\StoreManagerInterface;

class MyClass
{
protected $storeManager;

public function __construct(
StoreManagerInterface $storeManager
) {
$this->storeManager = $storeManager;
}

public function getStoreId()
{
return $this->storeManager->getStore()->getStoreId();
}
}
“`

Make sure to inject the `StoreManagerInterface` into your class constructor.

2. Using the Context Object:
The Context object (`\Magento\Framework\App\Http\Context`) provides access to the store ID value. Here’s an example:

“`php
use Magento\Framework\App\Http\Context as HttpContext;

class MyClass
{
protected $httpContext;

public function __construct(
HttpContext $httpContext
) {
$this->httpContext = $httpContext;
}

public function getStoreId()
{
return $this->httpContext->getValue(\Magento\Store\Model\StoreManagerInterface::CONTEXT_STORE);
}
}
“`

3. Using the Object Manager (Not Recommended):
You can use the Object Manager directly, but it’s not recommended. Here’s an example:

“`php
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$storeManager = $objectManager->get(\Magento\Store\Model\StoreManagerInterface::class);
$storeId = $storeManager->getStore()->getStoreId();
“`

Note that using the Object Manager directly is not recommended due to potential issues with code maintainability and best practices. It’s better to use dependency injection to retrieve the necessary objects.

Choose the method that best suits your requirements and coding standards. It’s recommended to use dependency injection rather than using the Object Manager directly.