diff --git a/src/data/roadmaps/python-data-analysis/content/array-operations@qOZ-T7zaPjvIT222rSV4o.md b/src/data/roadmaps/python-data-analysis/content/array-operations@qOZ-T7zaPjvIT222rSV4o.md
index 5411052cd..942da117c 100644
--- a/src/data/roadmaps/python-data-analysis/content/array-operations@qOZ-T7zaPjvIT222rSV4o.md
+++ b/src/data/roadmaps/python-data-analysis/content/array-operations@qOZ-T7zaPjvIT222rSV4o.md
@@ -5,5 +5,5 @@ NumPy supports a wide range of array operations: element-wise arithmetic, aggreg
 Visit the following resources to learn more:
 
 - [@article@NumPy Arithmetic Array Operations](https://www.programiz.com/python-programming/numpy/basic-array-operations)
-- [@video@Ultimate Guide to NumPy Arrays](https://www.youtube.com/watch?v=lLRBYKwP8GQ)
-- [@article@Doing Math with Arrays](https://towardsdatascience.com/introducing-numpy-part-4-doing-math-with-arrays-5e77ac595641/)
\ No newline at end of file
+- [@article@Doing Math with Arrays](https://towardsdatascience.com/introducing-numpy-part-4-doing-math-with-arrays-5e77ac595641/)
+- [@video@Ultimate Guide to NumPy Arrays](https://www.youtube.com/watch?v=lLRBYKwP8GQ)
\ No newline at end of file
diff --git a/src/data/roadmaps/python-data-analysis/content/dictionaries@lReYQM-p8rrYcHkaqzbMr.md b/src/data/roadmaps/python-data-analysis/content/dictionaries@lReYQM-p8rrYcHkaqzbMr.md
index d724cf282..3f98e09f1 100644
--- a/src/data/roadmaps/python-data-analysis/content/dictionaries@lReYQM-p8rrYcHkaqzbMr.md
+++ b/src/data/roadmaps/python-data-analysis/content/dictionaries@lReYQM-p8rrYcHkaqzbMr.md
@@ -6,4 +6,5 @@ Visit the following resources to learn more:
 
 - [@official@Dictionaries](https://docs.python.org/3/tutorial/datastructures.html#dictionaries)
 - [@article@Hashmaps in Python: Master Implementation and Use Cases](https://roadmap.sh/python/hashmap)
+- [@article@Python KeyError Exceptions: Causes and Fixes](https://roadmap.sh/python/keyerror)
 - [@video@Python dictionaries are easy 📙](https://www.youtube.com/watch?v=MZZSMaEAC2g)
\ No newline at end of file
diff --git a/src/data/roadmaps/python-data-analysis/content/null@GidLncxwx7d1QzAOfHRLX.md b/src/data/roadmaps/python-data-analysis/content/null@GidLncxwx7d1QzAOfHRLX.md
new file mode 100644
index 000000000..d6d3f8449
--- /dev/null
+++ b/src/data/roadmaps/python-data-analysis/content/null@GidLncxwx7d1QzAOfHRLX.md
@@ -0,0 +1,8 @@
+# Null Values
+
+Null values represent missing or undefined data within a dataset, signaling that a specific observation or entry is absent. In Python, this is typically represented by `None`, while libraries like pandas utilize `NaN` (Not a Number) to denote missing numeric information. Handling these values is a fundamental step in data cleaning, as they must be identified and addressed to ensure that statistical calculations and machine learning models perform accurately.
+
+Visit the following resources to learn more:
+
+- [@article@Python Null (None): Guide to Missing Values and NoneType](https://roadmap.sh/python/null#the-most-common-uses-of-none)
+- [@article@Null in Python: Understanding Python's NoneType Object](https://realpython.com/null-in-python/)
\ No newline at end of file