How to programmatically create shipment in magento2

Here we learn in Magento2- how to create a shipment of an order programmatically.
If you want to create a custom quote and order programmatically then you can check this blog Create Quote & Order Programmatically

Create Shipment of an order-

<?php
 
namespace Webkul\Test\Controller\Order;

use Magento\Framework\App\Action\Context;
 
class CreateShipment extends \Magento\Framework\App\Action\Action
{
    /**
     * @var \Magento\Sales\Api\OrderRepositoryInterface
     */
    protected $_orderRepository;

    /**
     * @var \Magento\Sales\Model\Convert\Order
     */
    protected $_convertOrder;

    /**
     * @var \Magento\Shipping\Model\ShipmentNotifier
     */
    protected $_shipmentNotifier;

    /**
     * @param Context                                     $context
     * @param \Magento\Sales\Api\OrderRepositoryInterface $orderRepository
     * @param \Magento\Sales\Model\Convert\Order          $convertOrder
     * @param \Magento\Shipping\Model\ShipmentNotifier    $shipmentNotifier
     */
    public function __construct(
        Context $context,
        \Magento\Sales\Api\OrderRepositoryInterface $orderRepository,
        \Magento\Sales\Model\Convert\Order $convertOrder,
        \Magento\Shipping\Model\ShipmentNotifier $shipmentNotifier
    ) {
        $this->_orderRepository = $orderRepository;
        $this->_convertOrder = $convertOrder;
        $this->_shipmentNotifier = $shipmentNotifier;
        parent::__construct($context);
    }

    /**
     * Test Order Create Shipment Controller
     */
    public function execute()
    {
        $orderId = 1;
        $order = $this->_orderRepository->get($orderId);

        // to check order can ship or not
        if (!$order->canShip()) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __("You can't create the Shipment of this order.")
            );
        }

        $orderShipment = $this->_convertOrder->toShipment($order);

        foreach ($order->getAllItems() as $orderItem) {
            // Check virtual item and item Quantity
            if (!$orderItem->getQtyToShip() || $orderItem->getIsVirtual()) {
                continue;
            }

            $qty = $orderItem->getQtyToShip();
            $shipmentItem = $this->_convertOrder->itemToShipmentItem($orderItem)->setQty($qty);

            $orderShipment->addItem($shipmentItem);
        }

        $orderShipment->register();
        $orderShipment->getOrder()->setIsInProcess(true);
        try {
            // Save created Order Shipment
            $orderShipment->save();
            $orderShipment->getOrder()->save();

            // Send Shipment Email
            $this->_shipmentNotifier->notify($orderShipment);
            $orderShipment->save();
        } catch (\Exception $e) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __($e->getMessage())
            );
        }
    }
}

In this way, you can create a shipment for a particular complete order.
If you want to create the invoice of an order in Magento 2, you can check the wonderful blog from here Create Invoice Programmatically

Hope it will help you. Thank you.