diff --git a/ROADMAP.md b/ROADMAP.md
index ba4aab3..b16e824 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -24,6 +24,14 @@ If you are new to the programming world then in the initial week, just begin wit
Objects: These in OOP is a data type made by the software developer itself. It has various properties, objects, and methods.
Lambda: The function which is not well described employing the basic format of function mentioning def keyword is called lambda function.
Inheritance: It’s the procedure of sharing the functionality within different classes. Moreover, it assists to describe a class completely based on another class.
+Lists: Lists are just like dynamic sized arrays, declared in other languages (vector in C++ and ArrayList in Java). Lists need not be homogeneous always which makes it the most powerful tool in Python.
+
+Tuple: A Tuple is a collection of Python objects separated by commas. In some ways, a tuple is similar to a list in terms of indexing, nested objects, and repetition but a tuple is immutable, unlike lists that are mutable.
+
+Set: A Set is an unordered collection data type that is iterable, mutable, and has no duplicate elements. Python’s set class represents the mathematical notion of a set.
+
+Dictionary: Dictionary in Python is an ordered (since Py 3.7) [unordered (Py 3.6 & prior)] collection of data values, used to store data values like a map, which, unlike other Data Types that hold only a single value as an element, Dictionary holds key:value pair. Key-value is provided in the dictionary to make it more optimized.
+
Reflection: It’s the basic ability for a specific code to be able to find out specific attributes about various objects that may be passed as basic measures to a function.
@@ -44,4 +52,14 @@ If you are new to the programming world then in the initial week, just begin wit
-## Level 4 : Work In progress.
+## Level 4 : Start developing Projects
+
+
+- Simple interest/ EMI calculator
+ - Weather application
+ - Simple Crawler
+ - E-commerce site
+ - A Web-based crawler
+ - Online CV generator
+ - Visualising and forecasting stocks using Dash
+