Where do u find the html thingy on computer? In other words, how to create a code and run it in a web browser

Answer 1

Yes, for the thingy, start a course:
https://www.sololearn.com/learn/HTML/1023/

As for JavaScript, you can type it in script tags or in external file and link it to your html file.

Answer 2

Create it yourself,
Take the course, open notepad type what you learn.
Save it as .html
Then you can open it in web browser

Answer 3

Thanks for the help :)