Your assignment: create a particle collision like the one shown in the tutorials (part I and II).
Tips:
If you find that your timeline duration is too short and/or your timeline is not counting in seconds, right click in the blank space of the timeline and select Project Properties (command J). In the Properties inspector, change duration to seconds instead of frames or timecode and then enter in the number of seconds you want your whole project to last for.
It's OK if your background is not the same blue as his--you can choose any color(s) here.
When he hits the "backwards arrow" to center the particle in the screen, instead, click the menu arrow next to the button that says "hide" (to the right of the parameter menu title) and select "reset parameter." This will come up several times during the tutorial.
When adjusting the Wriggle on Emitter 2, you won't have a "generate" button on the Random Seed tool. Instead, click the refresh icon (looks like arrows going in a circle).
When he duplicated the blue color in the gradient, he says to hold the alt key. This is the same as the option key.
When done: export the animation and post it to the Animation tab on your website. If you forget how to do this, watch this tutorial: how to export and post an animation to your Google Site.