diff --git a/file_handling.py b/file_handling.py
index 5c41621..45d8faf 100644
--- a/file_handling.py
+++ b/file_handling.py
@@ -36,6 +36,8 @@
 file.close
 
 ## using write with with()
+# the advantage of using with is that it ensures the file is closed
+# after nested block of code is ran 
 
 with open('trial.txt','r+') as file:
     text = file.read()
diff --git a/file_handling_2.py b/file_handling_2.py
index fb9be83..eae27c3 100644
--- a/file_handling_2.py
+++ b/file_handling_2.py
@@ -21,7 +21,7 @@
 filenew = open("student.dat" , "w")
 No_of_stdnt = int(input("enter the no of students in class :"))
 for i in range(No_of_stdnt):
-    name = input("Enter the name of the studnet :")
+    name = input("Enter the name of the student :")
     roll = int(input("enter the roll no of the student :"))
     Marks = int(input("eneter the marks obtained by the student :"))
     data = str(roll) + "," + name + "," + str(Marks) + '\n'
diff --git a/file_handling_3.py b/file_handling_3.py
index e69de29..32a0a9c 100644
--- a/file_handling_3.py
+++ b/file_handling_3.py
@@ -0,0 +1,42 @@
+### continued ...........
+## File pointer    ( analogous to a bookmark in a book )
+
+import sys
+import os
+
+## infile = open("filename","r") would open the file and put the file
+# pointer at the beginning of the file
+# ch = infile.read(1) would read 1 byte (one character)  from the file
+# str = infile.read(2) would read 2 bytes from the place where the
+# file pointer left 
+
+#############################################
+###       WORKING WITH BINARY FILES       ###
+#############################################
+
+import pickle
+
+# pickling / serialisation = converting an python object into a byte-stream 
+# unpickling / deserialization = converting the byte stream again into python object
+##  the pickle module has dump() and load() methods to write and read to and from a file
+# Creating / opening / closing binary files
+#  
+
+dfile = open("student_new.dat","ab")  # b specifies to open it in binary mode
+data = {}  ## creating an empty dictionary
+No_of_stdnt = int(input("enter the no of students in class :"))
+for i in range(No_of_stdnt):
+    name = input("Enter the name of the student :")
+    roll = int(input("enter the roll no of the student :"))
+    marks = int(input("eneter the marks obtained by the student :"))
+    data['Name'] = name
+    data['Roll'] = roll
+    data['Marks'] = marks
+    ## the above three lines fillup the dictionary
+    pickle.dump(data,dfile)
+
+dfile.close()
+
+
+
+
diff --git a/student_new.dat b/student_new.dat
new file mode 100644
index 0000000..e71a9cb
Binary files /dev/null and b/student_new.dat differ