Update README.md

Author: madhurimarawat

README.md

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 This repository contains basic programs in the python programming language.<br><br>
 <img src="https://media3.giphy.com/media/coxQHKASG60HrHtvkt/giphy.gif?cid=790b7611dkgau1ujakt3igpplm9r0nkfvams42q5y263yifr&ep=v1_gifs_search&rid=giphy.gif&ct=g" title="Python Gif" alt="Python">
 
-<br>
+---
+
 <centre><h1>About Python Programming</h1></centre>
 --> Python is a high-level, general-purpose, and very popular programming language.<br><br>
 --> Python programming language (latest Python 3) is being used in web development, Machine Learning applications, along with all cutting-edge technology in Software Industry.
 .<br><br>
 --> Python is available across widely used platforms like Windows, Linux, and macOS.<br><br>
 --> The biggest strength of Python is huge collection of standard library .<br>
 
-<centre><h1>Modes of Executions</h1></centre>
+---
+
+<h1>Modes of Executions</h1>
 Python programming language can be executed in the following two modes:
 <h2>1. Interactive mode</h2>
 <h3>a) Python Shell</h3>
@@ -27,11 +30,12 @@ Colaboratory, or “Colab” for short, is a product from Google Research which
 Python programs are written in editors and saved as the file with the .py extension which can be executed further. <br>
 <br>
 
+---
+
+<h1>Basic Datatypes</h1>
 
 ![20638Python-Data-Types](https://github.com/madhurimarawat/Python-for-Datascience/assets/105432776/62c5b8d2-21f1-4515-9b8a-8acf12ea1a58)
 
-<br>
-<centre><h1>Basic Datatypes</h1></centre>
 <h2> Numbers</h2>
 ✓ Number data type stores numerical values only.<br><br>
 --> It is further classified into three different types: <br>
@@ -42,20 +46,21 @@ spaces.<br><br>
 --> We can use single, double, or triple quotes to define a string.
 <h2>List</h2>
 ✓ Lists are used when we need a simple iterable collection of data that may go for frequent modifications.<br><br>
--->For example, if we store the names of students of a class in a list, then it is easy to update the list when 
+--> For example, if we store the names of students of a class in a list, then it is easy to update the list when 
 some new students join or some leave the course.
 <h2>Tuple</h2>
 ✓ Tuples are used when we do not need any change in the data.<br><br>
--->For example, names of months in a year.
+--> For example, names of months in a year.
 <h2>Sets</h2>
 ✓ Sets are used when we need uniqueness of elements and to avoid duplicacy it is preferable to use sets.<br><br>
--->For example, list of items in a museum.
+--> For example, list of items in a museum.
 <h2>Dictionary</h2>
 ✓ Dictionaries are used if our data is being constantly modified or we need a fast lookup based on a custom 
 key or we need a association between the key : value pair.<br><br>
--->For Example, A mobile phone book is a good application of dictionary.
+--> For Example, A mobile phone book is a good application of dictionary.
+
+---
 
-<br>
 <h1>Libraries Used</h1>
 <p>Short Description about all libraries used.</p>
 <ul>