On JSP, yes JSP, the taglib directive declares that your JSP page uses a set of custom tags, the usage of JSTL can be quick straightforward:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Hello from JSP</title>
</head>
<body>
${label} <br>
<c:out value="Example taglib" /> <!-- the c is the tag lib using the core jstl core taglib -->
<c:out value="Let's output this" />
<c:set var="dummyName" scope="session" value="2000"/>
<c:out value = "${dummyName}" />
<c:if test="${dummyName!=null}">
No estoy embarasada!
</c:if>
<a href = "<c:url value = "https://www.youtube.com/watch?v=68-2C9L5dJM"/>">URL test</a>
<c:forEach var="headerValue" items="${header}">
${headerValue.key},${headerValue.value}<BR />
</c:forEach>
</body>
</html>
Tutorials
For a complete tutorial, my favourite references are TutorialsPoint and W3 Processing, for sure. Seeing what is useful for you project. It is interesting that one Eclipse/Netbeans just click Dynamic Web Project striaght way, no need for web.xml file as before.
JSP is appropriate for fast prototyping and easily deployment. Of course this technology is being deprecated for Django/Python, which I already had made some posts here, but will do more eventually.
Overhead de Melo 