After saving data always you need to redirect to custom URL or sometime to previous page. so in this article I want to share a pace of redirect cod.

Assume your controller name is Test and your action is name Index. AS you know we have a class to each action.

namespace Darvishani\Module\Controller\Test;
    use Magento\Framework\Controller\ResultFactory; 

    class Index extends \Magento\Framework\App\Action\Action
    {      
        protected $resultFactory;

        public function __construct(
            \Magento\Framework\Controller\ResultFactory $resultFactory,
            \Magento\Framework\App\Action\Context $context
        )
        {
        $this->resultFactory = $resultFactory;

        parent::__construct($context);
        }

        public function execute()
        {
            $redirect = $this->resultFactory->create(\Magento\Framework\Controller\ResultFactory::TYPE_REDIRECT);
            $redirect->setUrl('frontname/controller/action');

            return $redirect;
        }
    }

How about when you want to redirect to previous page.

namespace Darvishani\Module\Controller\Test;
    use Magento\Framework\Controller\ResultFactory; 

    class Index extends \Magento\Framework\App\Action\Action
    {      
        public function execute()
        {
            $resultRedirect = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
            $resultRedirect->setUrl($this->_redirect->getRefererUrl());

            return $resultRedirect;
        }
    }