paragraph is not showing up on the browser. checked the .js links and everything is fine. no error in the console.

First problem is I think you commented out your vars. // const firstName = prompt("type first name"); const lastname = prompt("type last name");.

const firstName = prompt("type first name"); const lastname = prompt("type last name");

The second is you missed the backticks in your sentence var it should be const sentence = `<p>your first name is ${firstName} and you last name is ${lastname}.</p>`;

and lastly, you just need to change the uppercase d in Doucment.querySelector to a lowercase d

I wish I could explain the backticks part more but im a beginner as well there's some docs on template literals on MDN https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals Hope you found your answer :)

all together it will look like

const firstName = prompt("type first name");
const lastname = prompt("type last name");

const sentence = `<p>your first name is ${firstName} and you last name is ${lastname}.</p>`;
docuemnt.querySelector('main').innerHTML = sentence;

I believe Document should be in lowercase. Also did you comment out const firstName = prompt("type first name");? I noticed the //.