Like I said, there are a plethora of ways we can make free energy but the earth battery seems to me like a good starting point for a beginner because it is in fact the most simple. Once you get your head around this concept you can expand out from there.
I assumed writing this post that people will have a knowledge already of what is the difference between wiring cells in parallel or in series. (Which is the key to unlocking infinite levels of voltage & amperage from your earth battery). But that was probably a big assumption so if this sounds confusing for people please first spend some time wiring a circuit in the following two ways, so that you may understand the difference:
Then go back to the earth battery and enjoy your games which will lead you directly to unlimited free energy!