The good news is that HTML is fairly simple to learn and there is plenty of resources available for free on the internet!
Aim at learning the basics of HTML, tags, elements and web page structure.
If you prefer to learn from written material, here are some great resources to learn HTML:
2. Code editors
There are a variety of code editors available. Visual Studio Code is one of the most popular and usually recommended by the community. It's free and opensource!
And here is the link to the official website where you can download Visual Studio Code 👌:
Alternative to VS Code
As an alternative, Atom, developed by GitHub, is also a very popular code editor: