How to add data in database magento 2

Question

I just wanted to add data in the database from this page. Wanted to add just two filed in a database table that I created so I want to know how can I add these data in table any reference or code appreciated. Here's my code:

<?php
/**
 * @category   Mr
 * @package    Mr_Dukaaniatest
 * @author     jhondoe17@protonmail.com
 * @copyright  This file was generated by using Module Creator(http://code.vky.co.in/magento-2-module-creator/) provided by VKY <viky.031290@gmail.com>
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

namespace Mr\Dukaaniatest\Block\Adminhtml\Items\Edit\Tab;

use Magento\Backend\Block\Widget\Form\Generic;
use Magento\Backend\Block\Widget\Tab\TabInterface;

class Main extends Generic implements TabInterface
{
    protected $_wysiwygConfig;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context, 
        \Magento\Framework\Registry $registry, 
        \Magento\Framework\Data\FormFactory $formFactory,  
        \Magento\Cms\Model\Wysiwyg\Config $wysiwygConfig, 
        array $data = []
    ) 
    {
        $this->_wysiwygConfig = $wysiwygConfig;
        parent::__construct($context, $registry, $formFactory, $data);
    }

    /**
     * {@inheritdoc}
     */
    public function getTabLabel()
    {
        return __('Item Information');
    }

    /**
     * {@inheritdoc}
     */
    public function getTabTitle()
    {
        return __('Item Information');
    }

    /**
     * {@inheritdoc}
     */
    public function canShowTab()
    {
        return true;
    }

    /**
     * {@inheritdoc}
     */
    public function isHidden()
    {
        return false;
    }

    /**
     * Prepare form before rendering HTML
     *
     * @return $this
     * @SuppressWarnings(PHPMD.NPathComplexity)
     * @SuppressWarnings(PHPMD.ExcessiveMethodLength)
     */
    protected function _prepareForm()
    {
        $model = $this->_coreRegistry->registry('current_mr_dukaaniatest_items');
        /** @var \Magento\Framework\Data\Form $form */
        $form = $this->_formFactory->create();
        $form->setHtmlIdPrefix('item_');
        $fieldset = $form->addFieldset('base_fieldset', ['legend' => __('Item Information')]);
        if ($model->getId()) {
            $fieldset->addField('dukaaniatest_id', 'hidden', ['name' => 'dukaaniatest_id']);
        }
        $fieldset->addField(
            'title',
            'text',
            ['name' => 'title', 'label' => __('Vendor 1'), 'title' => __('Vendor 1'), 'required' => true]
        );
        $fieldset->addField(
            'author',
            'text',
            ['name' => 'author', 'label' => __('Vendor 2'), 'title' => __('Vendor 2'), 'required' => true]
        );


        $form->setValues($model->getData());
        $this->setForm($form);
        return parent::_prepareForm();
    }
}

this is the code of save page (controller)

/home1/dukaania/public_html/testing2/app/code/Mr/Dukaaniatest/Controller/Adminhtml/Items/Save.php

<?php

namespace Mr\Dukaaniatest\Controller\Adminhtml\Items;

class Save extends \Mr\Dukaaniatest\Controller\Adminhtml\Items
{
    public function execute()
    {
        if ($this->getRequest()->getPostValue()) {
            try {
                $model = $this->_objectManager->create('Mr\Dukaaniatest\Model\Dukaaniatest');
                $data = $this->getRequest()->getPostValue();
                if(isset($_FILES['image']['name']) && $_FILES['image']['name'] != '') {
                    try{
                        $uploaderFactory = $this->uploaderFactory->create(['fileId' => 'image']);
                        $uploaderFactory->setAllowedExtensions(['jpg', 'jpeg', 'gif', 'png']);
                        $imageAdapter = $this->adapterFactory->create();
                        $uploaderFactory->addValidateCallback('custom_image_upload',$imageAdapter,'validateUploadFile');
                        $uploaderFactory->setAllowRenameFiles(true);
                        $uploaderFactory->setFilesDispersion(true);
                        $mediaDirectory = $this->filesystem->getDirectoryRead($this->directoryList::MEDIA);
                        $destinationPath = $mediaDirectory->getAbsolutePath('mr/dukaaniatest');
                        $result = $uploaderFactory->save($destinationPath);
                        if (!$result) {
                            throw new LocalizedException(
                                __('File cannot be saved to path: $1', $destinationPath)
                            );
                        }

                        $imagePath = 'mr/dukaaniatest'.$result['file'];
                        $data['image'] = $imagePath;
                    } catch (\Exception $e) {
                    }
                }
                if(isset($data['image']['delete']) && $data['image']['delete'] == 1) {
                    $mediaDirectory = $this->filesystem->getDirectoryRead($this->directoryList::MEDIA)->getAbsolutePath();
                    $file = $data['image']['value'];
                    $imgPath = $mediaDirectory.$file;
                    if ($this->_file->isExists($imgPath))  {
                        $this->_file->deleteFile($imgPath);
                    }
                    $data['image'] = NULL;
                }
                if (isset($data['image']['value'])){
                    $data['image'] = $data['image']['value'];
                }
                $inputFilter = new \Zend_Filter_Input(
                    [],
                    [],
                    $data
                );
                $data = $inputFilter->getUnescaped();
                $id = $this->getRequest()->getParam('id');
                if ($id) {
                    $model->load($id);
                    if ($id != $model->getId()) {
                        throw new \Magento\Framework\Exception\LocalizedException(__('The wrong item is specified.'));
                    }
                }
                $model->setData($data);
                $session = $this->_objectManager->get('Magento\Backend\Model\Session');
                $session->setPageData($model->getData());
                $model->save();
                $this->messageManager->addSuccess(__('You saved the item.'));
                $session->setPageData(false);
                if ($this->getRequest()->getParam('back')) {
                    $this->_redirect('mr_dukaaniatest/*/edit', ['id' => $model->getId()]);
                    return;
                }
                $this->_redirect('mr_dukaaniatest/*/');
                return;
            } catch (\Magento\Framework\Exception\LocalizedException $e) {
                $this->messageManager->addError($e->getMessage());
                $id = (int)$this->getRequest()->getParam('id');
                if (!empty($id)) {
                    $this->_redirect('mr_dukaaniatest/*/edit', ['id' => $id]);
                } else {
                    $this->_redirect('mr_dukaaniatest/*/new');
                }
                return;
            } catch (\Exception $e) {
                $this->messageManager->addError(
                    __('Something went wrong while saving the item data. Please review the error log.')
                );
                $this->_objectManager->get('Psr\Log\LoggerInterface')->critical($e);
                $this->_objectManager->get('Magento\Backend\Model\Session')->setPageData($data);
                $this->_redirect('mr_dukaaniatest/*/edit', ['id' => $this->getRequest()->getParam('id')]);
                return;
            }
        }
        $this->_redirect('mr_dukaaniatest/*/');
    }
}