Answer 1

That is pretty simple:
- either you can use just an editor and plain HTML files directly opened in your browser
- or you can use PHP/Python/NodeJS for running simple server with HTML apps - anyway this will you need only when you have any Ajax requests for JSON or whatever (because not all browsers support Ajax requests for local files)
- the last option is using "big" server - either any of existing LAMPP solutions or Microsoft's IIS (if you are planning to learn also to SQL or PHP etc. is this the best way)