<p> is the paragraph tag. As the name implies, it is used to group tags into paragraphs. It must be closed. This must go inside the body tag.

<br/> is the line break tag. As the name implies, it starts a new line. It is a self-closing tag. This must go inside the body tag.

<div> is the division tag. As the name implies, it splits your code into groups. It must be closed. This must go inside the body tag.

<script> is the script tag. As the name implies, it sets the code within it to JavaScript. This can go in either the body or head tag.

<style> is the script tag. As the name implies, it sets the code within it to JavaScript. This must go inside the head tag.