What should I learn first python or html

Answer 1

These are completely different things . One is a programing language and another is markup language. That should be your choice if you want to go in the field of data science or hacking . Then you may go through python.
But if you want to go in the field of web development then go through html css and js

Answer 2

If you want to learn Python for Web Development, especially Backend Web Development, you should know basic HTML first. For a backend developer, the frontend is not important. But to practice on your own, you must need something for frontend, and for that HTML is important.