Updates

analogies.md

@@ -1,4 +1,9 @@
-# Analogies to help understand bitcoin
+# Part 1, Bitcoin analogies
+
+Bitcoin is unlike anything that has existed before, but from some points of
+view it is similar to things we are already familiar with. In this video some
+of these similarities are introduced and Bitcoin will be compared to things you
+already know.
 
 ## Bitcoin is like digital money
 

intro.md

@@ -18,3 +18,15 @@
 - Lesson 9: [Using a hardware wallet, recovery](ledger_recovery.md)
 - Lesson 10: [Using a hardware wallet, buying bitcoin](ledger_buying.md)
 - Lesson 11: [Using a hardware wallet, sending bitcoin](ledger_sending.md)
+
+Welcome to educational Bitcoin videos. The purpose of this course is to provide
+an introduction to Bitcoin. It is divided into three bigger parts, each
+consisting of three or four smaller short videos. You can consume these videos
+easily when you have a bit of free time and rewatch them for better understanding.
+
+Part one is about the theory of Bitcoin. What it is or isn't, what you can do
+with it or can't do with it, and what you should or shouldn't do with it.
+
+Part two is about using Bitcoin on your mobile phone.
+
+Part three is about using Bitcoin with a secure device.