What should I learn so I can create a website

Answer 1

html + css + js + php + sql
python can help too.

Answer 2

To make a website:
A website mainly contains 2 parts:
1. Frontend: HTML, CSS, JavaScript. Its the stuff you see on your browser the designing thing.
2. Backend: The one who controls the database and responds to the user in giving the requested data to the user. For this many languages can be used such as php, python, JavaScript as well, ruby ...
then you need the commands of database which you will be using in your website like mysql, mongoDB etc.

I would suggest you start from freecodecamp.org
then you can boost up your learning speed by taking courses on udemy and many other sites.