Get the Base Url

Data.php

<?php
/**
 * MageVision Blog29
 *
 * @category     MageVision
 * @package      MageVision_Blog29
 * @author       MageVision Team
 * @copyright    Copyright (c) 2018 MageVision (https://www.magevision.com)
 * @license      http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */
namespace MageVision\Blog29\Helper;

use Magento\Framework\App\Helper\AbstractHelper;
use Magento\Framework\App\Helper\Context;
use Magento\Store\Model\StoreManagerInterface;

class Data extends AbstractHelper
{
    /**
     * @var StoreManagerInterface
     */
    protected $storeManager;

    /**
     * @param Context $context
     * @param StoreManagerInterface $storeManager
     */
    public function __construct(
        Context $context,
        StoreManagerInterface $storeManager
    ) {
        parent::__construct($context);
        $this->storeManager = $storeManager;
    }

    /**
     * Get the base url
     *
     * @return string|null
     * @throws \Magento\Framework\Exception\NoSuchEntityException
     */
    public function getBaseUrl()
    {
        //examples
        $this->storeManager->getStore()->getBaseUrl(\Magento\Framework\UrlInterface::URL_TYPE_WEB);
        $this->storeManager->getStore()->getBaseUrl(\Magento\Framework\UrlInterface::URL_TYPE_DIRECT_LINK);
        $this->storeManager->getStore()->getBaseUrl(\Magento\Framework\UrlInterface::URL_TYPE_JS);
        $this->storeManager->getStore()->getBaseUrl(\Magento\Framework\UrlInterface::URL_TYPE_MEDIA);
        $this->storeManager->getStore()->getBaseUrl(\Magento\Framework\UrlInterface::URL_TYPE_STATIC);

        //default link type \Magento\Framework\UrlInterface::URL_TYPE_LINK
        return $this->storeManager->getStore()->getBaseUrl();
    }
}