I am going to assume that you are trying to make a title as in a heading. What the title tag is not to make titles but to title the website which appears on the tab. To make a heading you need to do this
<html> <head> <title> HELLO WORLD!</title> </head> <body> <h1>Hello World </h1> </body> </html>
Whatever you put in the body is the content of your website. And the H1 stands for heading 1. There are 6 levels of heading, h1 being the biggest and h6 being the smallest.
<h1>Hello World</h1> <h2>Hello World</h2> <h3>Hello World</h3> <h4>Hello World</h4> <h5>Hello World</h5> <h6>Hello World</h6>
FYI: to add pargraphs which is achieved by doing html <p>CONTENT HERE</p>
I hope I was able to help if so select the checkmark next to my comment which would be greatly appreciated.