Before we get handsy... here are some extensions that can help your coding process.

Learning Resources

MDN: HTML (HyperText Markup Language) 

https://medium.com/web-dev-basics/week-1-building-a-solid-foundation-with-html-f485669097f0

https://www.lifewire.com/why-use-semantic-html-3468271

https://medium.com/web-dev-basics/7-alternatives-to-the-div-html-tag-7c888c7b5036

Jon Duckett: HTML and CSS