diff --git a/learning_python3.md b/learning_python3.md
index eacb6d5..18023ff 100644
--- a/learning_python3.md
+++ b/learning_python3.md
@@ -69,6 +69,7 @@ There is a plethora of IDE's available and you can't really make a *wrong* choic
 
 TODO animated overview of the shell and the world of OOP
 
+
 # Installing pycharm
 
 TODO
@@ -168,6 +169,7 @@ print("Hello, my name is {} and I'm {} years old.".format(name, age))
 ## Some links to read up
 
 * [realpython string formatting](https://realpython.com/python-string-formatting/)
+* [realpython data types](https://realpython.com/python-data-types/)
 
 # Taking input
 
@@ -363,27 +365,34 @@ True
 
 ⛑ **Remember CTRL-q opens the documentation in Pycharm and don't forget to actually use it!**
 
+## Some links to read up on
+
+* [realpython](https://realpython.com/python-conditional-statements/) conditional logic
+
 # Coding challenge - Celsius to Fahrenheit converter
 
 Your first challenge!
-I would like you to write a program that converts celcius to farenheit.
+I would like you to write a program that converts Celsius to Fahrenheit.
 The result of this program *could* be as follows.
 
 ```bash
-➜  ~ git:(master) ✗ python3 ex_celcius_to_farenheit.py
+➜  ~ git:(master) ✗ python3 ex_celcius_to_fahrenheit.py
 What's the temperature?30
 30°C equals 86.0°F
 Go turn off the heating!
-➜  ~ git:(master) ✗ python3 ex_celcius_to_farenheit.py
+➜  ~ git:(master) ✗ python3 ex_celcius_to_fahrenheit.py
 What's the temperature?4
 4°C equals 39.2°F
 Brrrr, that's cold!
-➜  ~ git:(master) ✗ python3 ex_celcius_to_farenheit.py
+➜  ~ git:(master) ✗ python3 ex_celcius_to_fahrenheit.py
 What's the temperature?blabla
 I can't understand you...
 ➜  ~ git:(master) ✗ 
 ```
 
+If you want to make the program a bit more complex, try adding the reverse as in Fahrenheit to Celsius.
+Your first question to the user could then be *in which direction do you want to convert?*.
+
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