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Block/TrackOrder.php

+<?php
+namespace BobGroup\BobGo\Block;
+class TrackOrder extends \Magento\Framework\View\Element\Template
+{
+    public function __construct(
+        \Magento\Backend\Block\Template\Context $context,
+        array $data = []
+    )
+    {
+        parent::__construct($context, $data);
+    }
+
+    public function getHelloWorld()
+    {
+        return 'Hello World';
+    }
+
+}