i want to click in button and something happend like to go to a vidéo or somthing

Answer 1

show your code.
tag the relevant programming language.
describe precisely what it is supposed to do.

Answer 2

You can use a link <a>. Links are covered in the course.

Answer 3

i did jst <button> entrer</button>

Answer 4

Think about it, how is the code supposed to know what you want to happen when you click on the button.
You need to use Javascript.
Take the javascript lessons and if you still need help come back and ask.