How do I do this on a laptop

Answer 1

in addtion to Irwins answer.
* In your browser

Answer 2

see you will have to save the file in a particular
folder or save the file in a very known place
but keep in a folder it will be easier to open

and after that open the folder in which you save the file you will see your html file will be presently there
just double click and it will be open.

Answer 3

it is very easy just open Notpad
and start working.

But always save the file
for example irwin.html

.html is must

Answer 4

where will it run though