Animation tutorial

my first tutorial EVER!!!!!!!!!
hope it's clear enough. You can ask me questions if you want too. I'll try and answer all of them as well as I can.
No one has shown me how to animate before, and I had to learn on my own.
so.... hope the tutorial is clear enough and that it will probably make you want to try and animate as well
here is the animation on which the tutorial was based : [link]
make sure to check all its versions so you can see some of the differences between step 3 and 4 more clearly