Update 1_setup.md

Author: pareenaverma

content/learning-paths/servers-and-cloud-computing/java-perf-flamegraph/1_setup.md

@@ -7,17 +7,17 @@ layout: learningpathall
 ---
 
 
-## Before You Begin 
-- There are numerous performance analysis methods and tools for Java applications, among which the call stack flame graph method is regarded as a conventional entry-level approach. Therefore, generating flame graphs is considered a basic operation.
-- Various methods and tools are available for generating Java flame graphs, including `async-profiler`, `Java Agent`, `jstack`, `JFR` (Java Flight Recorder), etc.
-- This Learning Path focuses on introducing two simple and easy-to-use methods: `async-profiler` and `Java Agent`.
+## Overview 
+There are numerous performance analysis methods and tools for Java applications, among which the call stack flame graph method is regarded as a conventional entry-level approach. Therefore, generating flame graphs is considered a basic operation.
+Various methods and tools are available for generating Java flame graphs, including `async-profiler`, `Java Agent`, `jstack`, `JFR` (Java Flight Recorder), etc.
+This Learning Path focuses on introducing two simple and easy-to-use methods: `async-profiler` and `Java Agent`.
 
 
 ## Setup Benchmark Server - Tomcat
 - [Apache Tomcat](https://tomcat.apache.org/) is an open-source Java Servlet container that enables running Java web applications, handling HTTP requests and serving dynamic content.
 - As a core component in Java web development, Apache Tomcat supports Servlet, JSP, and WebSocket technologies, providing a lightweight runtime environment for web apps.
 
-1. Start by installing Java Development Kit (JDK) on your Arm-based server:
+1. Start by installing Java Development Kit (JDK) on your Arm-based server running Ubuntu:
 ```bash
 sudo apt update
 sudo apt install -y openjdk-21-jdk
@@ -62,10 +62,12 @@ Tomcat started.
 
 ![example image alt-text#center](./_images/lp-tomcat-examples.png "Tomcat-Examples")
 
+Make sure port 8080 is open in the security group of the IP address for your Arm-based Linux machine.
+
 ## Setup Benchmark Client - [wrk2](https://github.com/giltene/wrk2)
 `wrk2` is a high-performance HTTP benchmarking tool specialized in generating constant throughput loads and measuring latency percentiles for web services. `wrk2` is an enhanced version of `wrk` that provides accurate latency statistics under controlled request rates, ideal for performance testing of HTTP servers.
 
-Currently `wrk2` is only supported on x86 machines. You will run the Benchmark Client steps shown below on an x86_64 Linux machine.
+Currently `wrk2` is only supported on x86 machines. You will run the Benchmark Client steps shown below on an x86_64 server running Ubuntu.
 
 
 1. To use `wrk2`, you will need to install some essential tools before you can build it: