diff --git a/.vscode/settings.json b/.vscode/settings.json
index 32dee9a..74e879f 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -17,9 +17,8 @@
   "files.autoSave": "afterDelay",
   "screencastMode.onlyKeyboardShortcuts": true,
   "terminal.integrated.fontSize": 18,
-  "workbench.activityBar.visible": true,
-  "workbench.colorTheme": "Default Light Modern",
+  "workbench.colorTheme": "Visual Studio Dark",
   "workbench.fontAliasing": "antialiased",
   "workbench.statusBar.visible": true,
   "python.linting.enabled": false
-}
\ No newline at end of file
+}
diff --git a/Start/Ch 1/challenge.py b/Start/Ch 1/challenge.py
index 050cd6d..e6578a9 100644
--- a/Start/Ch 1/challenge.py	
+++ b/Start/Ch 1/challenge.py	
@@ -8,9 +8,16 @@
 # Company (string)
 # And a method get_description() which returns a string in the form
 # of "Ticker: Company -- $Price"
+#%%
 
+from abc import ABC, abstractmethod
 class Stock:
-    pass
+    def __init__(self, ticker, price, company):
+        self.ticker = ticker
+        self.price = price
+        self.company = company
+    def get_description(self):
+        return f"{self.ticker}: {self.company} -- ${self.price}"
 
 # ~~~~~~~~~ TEST CODE ~~~~~~~~~
 msft = Stock("MSFT", 342.0, "Microsoft Corp")
@@ -22,3 +29,5 @@ class Stock:
 print(goog.get_description())
 print(meta.get_description())
 print(amzn.get_description())
+
+# %%
diff --git a/Start/Ch 2/challenge.py b/Start/Ch 2/challenge.py
index 556fd1f..47af365 100644
--- a/Start/Ch 2/challenge.py	
+++ b/Start/Ch 2/challenge.py	
@@ -1,3 +1,6 @@
+
+#%%
+
 # Python Object Oriented Programming by Joe Marini course example
 # Programming challenge: use inheritance and abstract classes
 
@@ -12,14 +15,31 @@
 # For stocks: "Ticker: Company -- $Price"
 # For bonds: "description: duration'yr' : $price : yieldamt%"
 
-class Asset():
-    pass
+from abc import ABC, abstractmethod
+class Asset(ABC):
+    def __init__(self, price):
+        self.price = price
+    @abstractmethod
+    def get_description(self):
+        pass
+
 
-class Stock():
-    pass
+class Stock(Asset):
+    def __init__(self, ticker, price, company):
+        super().__init__(price)
+        self.ticker = ticker
+        self.company = company
+    def get_description(self):
+        return f"{self.ticker}: {self.company} -- ${self.price}"
 
-class Bond():
-    pass
+class Bond(Asset):
+    def __init__(self, price, description, duration, yieldamt):
+        super().__init__(price)
+        self.description = description
+        self.duration = duration
+        self.yieldamt = yieldamt
+    def get_description(self):
+        return f"{self.description}: {self.duration}yr : ${self.price} : {self.yieldamt}%"
 
 
 # ~~~~~~~~~ TEST CODE ~~~~~~~~~
@@ -47,3 +67,4 @@ class Bond():
 print(us10yr.get_description())
 print(us5yr.get_description())
 print(us2yr.get_description())
+# %%
diff --git a/Start/Ch 3/challenge.py b/Start/Ch 3/challenge.py
index 679db2b..7995f90 100644
--- a/Start/Ch 3/challenge.py	
+++ b/Start/Ch 3/challenge.py	
@@ -5,6 +5,7 @@
 # Stocks should sort from low to high on price
 # Bonds should sort from low to high on yield
 
+#%%
 from abc import ABC, abstractmethod
 
 
@@ -22,7 +23,11 @@ def __init__(self, ticker, price, company):
         super().__init__(price)
         self.company = company
         self.ticker = ticker
+    def __str__(self):
+        return f"{self.ticker}: {self.company} -- ${self.price}"
 
+    def __lt__(self, other):
+        return self.price < other.price
 
 class Bond(Asset):
     def __init__(self, price, description, duration, yieldamt):
@@ -30,7 +35,11 @@ def __init__(self, price, description, duration, yieldamt):
         self.description = description
         self.duration = duration
         self.yieldamt = yieldamt
+    def __str__(self):
+        return f"{self.description}: {self.duration}yr : ${self.price} : {self.yieldamt}%"
 
+    def __lt__(self, other):
+        return self.yieldamt < other.yieldamt
 
 # ~~~~~~~~~ TEST CODE ~~~~~~~~~
 stocks = [
diff --git a/Start/Ch 4/challenge.py b/Start/Ch 4/challenge.py
index f7634d0..b6e8136 100644
--- a/Start/Ch 4/challenge.py	
+++ b/Start/Ch 4/challenge.py	
@@ -5,17 +5,43 @@
 # The subclasses are required to override the magic method
 # that makes them sortable
 
-class Asset():
-    pass
-    
+#%%
+
+from dataclasses import dataclass
+from abc import ABC, abstractmethod
+
+@dataclass
+class Asset(ABC):
+    price: float
 
+    # @abstractmethod
+    # def __str__(self):
+    #     pass
+    @abstractmethod
+    def __lt__(self, other):
+        pass
+    
+@dataclass
 class Stock(Asset):
-    pass
+    ticker: str
+    company: str
 
+    # def __str__(self):
+    #     return f"{self.ticker}: {self.company} -- ${self.price}"
 
+    def __lt__(self, other):
+        return self.price < other.price
+@dataclass
 class Bond(Asset):
-    pass
+    description: str
+    duration: int
+    yieldamt: float
 
+    # def __str__(self):
+    #     return f"{self.description}: {self.duration}yr : ${self.price} : {self.yieldamt}%"
+    
+    def __lt__(self, other):
+        return self.yieldamt < other.yieldamt
 # ~~~~~~~~~ TEST CODE ~~~~~~~~~
 stocks = [
     Stock("MSFT", 342.0, "Microsoft Corp"),
@@ -44,3 +70,5 @@ class Bond(Asset):
 print("-----------")
 for bond in bonds:
    print(bond)
+
+# %%
diff --git a/branch_GitHub_link b/branch_GitHub_link
new file mode 100644
index 0000000..4824a0b
--- /dev/null
+++ b/branch_GitHub_link
@@ -0,0 +1,3 @@
+https://github.com/DonArchila/python-object-oriented-programming-4413110/tree/my_course_work
+
+this is a fork from original LinkedIn course with my changes and course work
\ No newline at end of file