I have a basic index.html page :

Instead of that , I want to put a simple Login , where the user enter the username and password , and only then redirect the user to a page with multiple options .
When I’m redirecting the user from index.html , should I redirect to another HTML page , or to a JSP page ? is there any difference ?
Regards
You can either redirect to an HTML page or a JSP one.
But I noticed that you are willing to have a Login page. It is better to use something like
j_security_checkorSpring Security. you can see some tutorials here. It gives you comfort achieving your goal.