This component inspired by this tutorial https://docs.joomla.org/J3.x:Developing_an_MVC_Component/Developing_a_Basic_Component. It covers some parts disscussed there and it is extended by composer/GUZZLEHHTP.

JFactory::getApplication()->enqueueMessage('Some debug string(s)');

• in view.html.php, we define the varible
• in /tmpl/default.php, we send the varibale to the frontend
• in /tmpl/default.xml, we show the menu im backend menu

1. rename file helloworld.xml
2. rename all helloworld files mentioned in this helloworld.xml file
3. re-/install component if necessary

1. in folder controllers create HelloWorldControllerStudent class (replace Helloworld with the name of your component) and extend it from JControllerLegacy (e.g. controllers/item.php)
2. in folder models create HelloWorldModelStudent class (replace Helloworld with the name of your component) and extend it from JModelItem (e.g. models/item.php)
3. in folder views create folder student and following files:

   views
   |---- student
   |     |----tmpl
   |     |    -- default.php
   |     |    -- default.xml
   |     |    -- index.html
   |     -- index.html 
   |     -- view.html.php

4. in the file view.html.php create class HelloWorldViewStudent get data from model and save it into variables
5. put defined variables into html template in default.php (e.g. views/item)