omnipotens Hello from Spain, you can start studying the basics of HTML, but if u wanna practice both at the same time, front-end and back-end, you have to study HTTP protocol in deep and make some form in html with some form elements and start learning how the front-end send data to the back-end, in the back-end u can start installing some GNU/Linux box with apache and PHP module, recieve the data u send and response to the client with some text or some web page 😃, start learning HTML and PHP both at the same time, but never forget to learn CSS and JavaScript to make webpages more interactive and later learn more about javascript and API’s in general,but start with HTML and PHP and Apache Server