BuddyPress.org

@vijayalogiclab
I would give it some time especially if you are new but if you want to jump in to the deep end then study the codex:
https://codex.buddypress.org/developer/plugin-development/
Also See:
https://codex.buddypress.org/developer/plugin-development/creating-a-plugin/
If you don’t understand PHP and WordPress hooks then go through template files and look for do_action. Those are places you can hook into. First you need a file header for WP and BP to recognize it as a plugin, see the second link above. You then need to create a function. You will then add_action to where you need the plugin to execute in BP based on do_action which is the hook, and then you call your function. Here is a brief example:

<?php
/*
Plugin Name: My Plugin
Plugin URI: http://URI_Of_Page_Describing_Plugin_and_Updates
Description: A brief description of the Plugin.
Tags: buddypress
Version: The Plugin's Version Number, e.g.: 1.0
Author: Name Of The Plugin Author
Author URI: http://URI_Of_The_Plugin_Author
License: A "Slug" license name e.g. GPL2
*/

function my_plugin() {
 //Your Code Goes Here
}
add_action('bp_head', 'my_plugin');
?>

If this makes no sense what-so-ever then you need to spend more time on the codex and learning PHP because I doubt anyone has the time to give you a complete lesson and it will benefit you more by learning to crawl a bit before you walk.