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Java is a programming language
J2EE is Java2 Platform Enterprise Edition, an enterprise-level platform technology architecture
JSP/Servelt is a dynamic web page technology, part of J2EE
Tomcat is a servlet container/server, on which JSP/Servlet can be run

You will know everything about writing a java web project

Java is a language, it goes without saying.
J2EE is one of SUN’s classifications of Java language usage platforms,

Currently, there are 3 versions of Java 2 platform. They are Java 2 Platform Micro Edition (J2ME) suitable for small devices and smart cards, and Java 2 Platform Standard Edition (Java 2 Platform) suitable for desktop systems. Standard Edition (J2SE), Java 2 Platform Enterprise Edition (J2EE) for creating server applications and services.

For the J2EE platform, SUN will add some functions to standard Java.

The foundation of J2EE technology is the standard version of the core Java platform or Java2 platform. J2EE not only consolidates many advantages of the standard version, such as the "write once, run anywhere" feature, JDBC API for convenient database access, CORBA technology and Security modes that can protect data in Internet applications, etc., and also provide comprehensive support for EJB (Enterprise JavaBeans), Java Servlets API, JSP (Java Server Pages) and XML technology.

J2EE includes Java Servlet API and JSP. In fact, Servlet and JSP are two specifications that stipulate the standard writing method of Servlet and JSP files.

According to specifications, all Java Web containers that want to enter this market must be able to run Servlets and JSP files that follow standard writing methods. Tomcat is a Java Web container that follows this specification. In addition, there are jetty, WebSphere, etc.

You use java [language], use jsp and Servlet [specific technology] to develop a web application, and then run it on tomcat [web server].
You can tell others that you wrote a j2ee [general name for an architecture] application