Answer 1

You can write html in a text-editor.A text editor is a editor where you can write any kinds of format and can safe the file in respective extension.Every Operating System (at least all I know) have default text editors.For windows they have something call 'Notepad'. To open Notepad click 'Window + R ' in keyboard and a small search(run) box will appear then write Notepad in that box and you can write your html there.When you finish writing save the file with 'any-name. html' or 'any-name.htm'. If you are in Linux they have 'gedit'(in most of Destros especially Ubuntu).To open gedit just go to dashboard or activities and write 'gedit' then the gedit logo will appear then press enter.The default editors don't have much functions to work.So expert give advice to use other code-editors like atom, note++ or sublime text.Sublime is my choice because it has many new functionality like multiple cursors, sublime REPL (where you can write server code without installing or setting up server) and etc