HTML

HTML Tag - SEMANTICS
This will make it easy for everyone to understand the structure of your web page.
<!DOCTYPE html> This tag is really important, this will let internet know what kind of file this is, with out it web-pages will have problem understanding what your file is trying to tell it.
<html> You will need to add everything inside this tag.
<head> This tag is really important, you can add all the meta information here. This is all the information the web-page will read to understand better what you are communicating.
<body> Here you will add all the information you want your HTML to display on the webpage.
<header> This is really well known in the web-development environment, it is where you can find most of the information and functionalities of your webpage.
<main> Here you will add the most important information of your webpage. SEO will prioritize this and see what it can find to return to the people.
<article> This is in a way a webpage with in your web page it means that it can stand by itself with out a problem.
<section> This is to separate the information and keep it organized.
<footer> This is the last part of your webpage, here normally you add the copywrite information, extra links and privacy policies.
This will help your site SEO.