The Time periods represented the different times and events from after and before like B.C. and A.D. except it's sexier. Let's begin.
A.G.A. - AGA means- After Ghost Anakin, this is after Anakin became a sexy ghost and became immortal and took over the world. So, The gerbish jad war and other things.
B.G.A. - Before Ghost Anakin Became A ghost and immortal and the savior of reality. So yes, praise the Lord.
Stickster Dynasty (SD) The Stickster Dynasty was right before Ghost Anakin but reborn after he became a ghost and it pretty much ruled Idaho from then on and forever.
Whoagh and Ghost Anakin Battle One and Two: These were two battles between Whoagh and Ghost Anakin and are Base Periods somethes used: "After/Before the First/Second Battle of Mount Dildo"
Gerbish-Jad War: A war waging on many years between the Senseist Cult and The Anakanism Cult, until a peace treaty was created.
Paradox Void of Creation: The beginning of time and existence.
This is basically it, more can be edited later.