@@ -2,7 +2,7 @@
 
 These are answers for exercises in the chapters. In programming, there's always more than one way to do things, so if your solution wasn't exactly like mine it's not necessarily wrong. Some Python users say that there should be only one right way, but that goal will never be fully reached.
 
-### Chapter 1
+## Chapter 1
 
 1. 18996.20 €
 
@@ -53,7 +53,7 @@ These are answers for exercises in the chapters. In programming, there's always
     >>>
     ```
 
-### Chapter 3
+## Chapter 3
 
 1. Content of the file:
 
@@ -94,7 +94,7 @@ These are answers for exercises in the chapters. In programming, there's always
     print(words * 1000)
     ```
 
-### Chapter 4
+## Chapter 4
 
 1. You can compare the word against an empty string (`""` or `''`). In this example, the password is "secret".
 
@@ -153,7 +153,8 @@ These are answers for exercises in the chapters. In programming, there's always
         Wrong password!
         >>>
 
-3. This is a great chance to use a while loop. In this example, the correct password is "secret".
+3. This is a great chance to use a while loop. In this example, the
+    correct password is "secret".
 
     ```py
     running = True
@@ -166,15 +167,30 @@ These are answers for exercises in the chapters. In programming, there's always
             print("Wrong password.")
     ```
 
-    Another alternative:
+    You can also use `break` to get out of a loop, and `while True:` to
+    do an infinite loop. This is recommended instead of the previous
+    alternative, because you don't need a useless `running` variable.
+
+    ```py
+    while True:
+        password = input("Enter your password: ")
+        if password == "secret":
+            print("Welcome!")
+            break
+        else:
+            print("Wrong password.")
+    ```
+
+    Even shorter alternative:
 
     ```py
     while input("Enter your password: ") != "secret":
         print("Wrong password.")
     print("Welcome!")
     ```
 
-4. One way to do this is to put the inputs directly to `if` and `elif` lines. Again, the correct password is "secret".
+4. One way to do this is to put the inputs directly to `if` and `elif`
+    lines. Again, the correct password is "secret".
 
     ```py
     if input("Enter your password: (3 attempts left) ") == "secret":
@@ -202,4 +218,8 @@ These are answers for exercises in the chapters. In programming, there's always
         Welcome!
         >>>
 
-[Home](README.md)
+***
+
+You may use this tutorial freely at your own risk. See [LICENSE](LICENSE).
+
+[Back to the list of contents](README.md)
@@ -9,7 +9,7 @@ This tutorial assumes that you know how functions work and how to
 create your own functions with the `def` keyword. If you don't, I
 highly recommend learning that first, and then moving to classes.
 
-### Why should I use custom classes in my projects?
+## Why should I use custom classes in my projects?
 
 Python comes with a lot of classes that you are already familiar with.
 
@@ -61,7 +61,7 @@ Python comes with. Instead you can define a Website class, and make
 Websites and process information about websites directly. Defining your
 own object types like this is called **object-orientated programming**.
 
-### First class
+## First class
 
 In Python, `pass` does nothing.
 
@@ -160,7 +160,7 @@ handy way to see which attributes the instance contains.
 >>> 
 ```
 
-### Class attributes
+## Class attributes
 
 What happens if we set an attribute of the `Website` class to some value
 instead of doing that to an instance?
@@ -205,7 +205,7 @@ access class attributes through instances also, so in this case
 confusing, which is why it's not recommended to use class attributes like
 this. Use instance attributes instead, e.g. `stackoverflow.is_online = True`.
 
-### Functions and methods
+## Functions and methods
 
 Let's define a function that prints information about a website.
 
@@ -276,7 +276,7 @@ In other words, `Class.method(instance)` does the same thing as
 `instance.method()`. This also works with built-in classes, for
 example `'hello'.lower()` is same as `str.lower('hello')`.
 
-### Defining methods when defining the class
+## Defining methods when defining the class
 
 Maybe we could define a method when we make the class instead of adding
 it later?
@@ -362,7 +362,7 @@ Free to use: True
 Classes have many other magic methods too, but I'm not going to cover
 them in this tutorial.
 
-### When should I use classes?
+## When should I use classes?
 
 Don't do this:
 
@@ -393,7 +393,7 @@ word = input("Enter something: ")
 print("You entered " + word + ".")
 ```
 
-### Important things
+## Important things
 
 Here are some of the most important things covered in this tutorial.
 Make sure you understand them.
@@ -413,3 +413,9 @@ Make sure you understand them.
 - `__init__` is a special method, and it's ran when a new instance of a
   class is created. It does nothing by default.
 - Don't use classes if your code is easier to read without them.
+
+***
+
+You may use this tutorial freely at your own risk. See [LICENSE](LICENSE).
+
+[Back to the list of contents](README.md)
@@ -20,7 +20,7 @@ you want to indent**. Your editor should give you four spaces when you
 hit the tab key. Your editor should also remove four spaces when you
 hit backspace and there are four spaces before the cursor.
 
-#### Geany
+### Geany
 
 1. Create a file called `hello.py`, and open it in geany. Or create a
     file in geany and save it as `hello.py`.
@@ -36,7 +36,7 @@ color than the rest of your text. `"Strings"`, `# comments` and
 everything else should also have their own colors. This makes it much
 easier to write code.
 
-#### Geany
+### Geany
 
 Geany has syntax highlighting by default. You can also install more
 [color schemes](https://www.geany.org/Download/Extras#colors) if you
@@ -47,7 +47,7 @@ View, then Change Color Scheme.
 
 Advanced editors support plugins. You may find some of them useful.
 
-#### Geany
+### Geany
 
 On Debian-based GNU/Linux distributions, install the geany-plugins
 package. See [the Geany website](https://plugins.geany.org/) for
 
@@ -3,7 +3,7 @@
 When you have a problem with Python, you're not alone! There are many
 places to ask for help in.
 
-### IRC
+## IRC
 
 IRC is the oldest chatting service I know, but as of 2016, it's still
 in use, and a great way to get help in Python. You don't need to
@@ -34,12 +34,12 @@ Do this:
 Don't do this:
 
     <you>   HEEEEELP MEEEEEEEEEEEEEEE!!!
-    <you>     File "foo", line 3
+    <you>     File "hello.py", line 3
     <you>       if a = b:
     <you>            ^
     <you>   SyntaxError: invalid syntax
 
-### Websites to ask help on
+## Websites to ask help on
 
 Personally, I've never asked a question on any of these sites. Getting
 help on IRC is much faster.
 
@@ -10,7 +10,7 @@ Let's get started!
 
 ## Downloading and installing Python
 
-#### Windows
+### Windows
 
 Use the official Python installer, it will install Python and IDLE for
 you.
@@ -22,12 +22,12 @@ you.
 4. Select the "advanced installation" option, and make sure the py.exe
     launcher gets installed.
 
-#### Mac OSX
+### Mac OSX
 
 I don't have an up-to-date copy of Mac OSX. If you would like to write
 instructions for OSX, [tell me](contact-me.md).
 
-#### GNU/Linux
+### GNU/Linux
 
 You already have Python, there's no need to download anything.
 
@@ -49,7 +49,7 @@ I'm not going to focus on the third option in this tutorial, but if you
 know how to use Python with something else than PowerShell, command
 prompt, a terminal or IDLE it's fine. Do whatever you want.
 
-#### If you are not an advanced user and you have no idea what PowerShell, command prompt and terminal are
+### If you are not an advanced user and you have no idea what PowerShell, command prompt and terminal are
 
 Use IDLE. Experienced Python users will say that IDLE is garbage, but
 don't listen to them. These people want you to use "better"
@@ -74,7 +74,7 @@ take more screenshots:
 The exact content of your Python's welcome message is probably different
 than mine, it's ok.
 
-#### If you like working with PowerShell, command prompt or terminal
+### If you like working with PowerShell, command prompt or terminal
 
 On Windows. you should be able to run Python from a PowerShell window,
 or a command prompt window if you don't have PowerShell. Open one of
 
@@ -10,7 +10,7 @@ boring.
 When you're done reading, read the summary and make sure you've learned
 everything.
 
-### Summary
+## Summary
 
 - Now you should have some kind of idea about what programming is.
 - Each value has a type, and you can find that out with `type(value)`.
 
@@ -1,6 +1,6 @@
 # 3. Using functions and storing code in files
 
-### Functions
+## Functions
 
 Now we know how to make Python show text.
 
@@ -103,7 +103,7 @@ Enter something: hello
 >>>
 ```
 
-### Storing code in files
+## Storing code in files
 
 Now it's time to write some code into a file for the first time. In IDLE, go to File at top left and select New File, or just press Ctrl+N.
 
@@ -136,7 +136,7 @@ After running the program you can check what the `word` variable contains in the
 >>>
 ```
 
-### Exercises
+## Exercises
 
 1. Write a program into a file that asks the user to write a word and then prints that word 1000 times. For example, if the user enters `hi` the program would reply `hihihihi...`.
 2. Make it to print spaces between the words. It should be like `hi hi hi hi...`.
 
@@ -1,6 +1,6 @@
 # 2. Variables, Booleans and None
 
-### Variables
+## Variables
 
 Variables are easy to understand. They simply **contain data**. Actually
 they [point to data](https://www.youtube.com/watch?v=_AEJHKGk9ns), but
@@ -109,7 +109,7 @@ variable called hello and then type hello:
 >>> 
 ```
 
-### Booleans
+## Booleans
 
 There are two Boolean values, True and False. In Python, and in many
 other programming languages, `=` is assigning and `==` is comparing.
@@ -142,7 +142,7 @@ False
 >>> 
 ```
 
-### None
+## None
 
 None is Python's "nothing" value. It behaves just like any other value,
 and it's often used as a default value for different kinds of things.
@@ -164,7 +164,7 @@ This is because the prompt never echoes back None. That is handy,
 because many things result in None, and it would be annoying to see
 None coming up all the time.
 
-### Other comparing operators
+## Other comparing operators
 
 So far we've used `==`, but there are other operators also. At this
 point, this list probably looks awfully long, but it's actually pretty
@@ -191,7 +191,7 @@ However, `!=` and `not in` should be used in cases like this because
 they're more convinient once you get used to them.
 
 There's also `is`, but don't use it instead of `==` unless you know
-what you are doing. We'll find uses for it later.
+what you are doing. We'll learn more about it later.
 
 ***