O__O'
Lets start with the basics...
Let us start at the very beginning, the elemental weaknesses and advantages of every element:
Fire
-Weak to water
-Strong against wind
Water
-Weak against earth
-Strong against fire
Earth
-Weak against lightning
-Strong against water
Lightning
-Weak against wind
-Strong against earth
Wind
-Weak against fire
-Strong against lightning
This is basic stuff that you should know from your other trainings... I have bolded the points more relevant to this training.
As you can see Lightning is strong against
Earth as lightning is able to cut straight through it, where as Lightning is weak to
Wind as wind acts as an insulator that prevents the flow of lightning.
You are correct that
Fire is neutral to Lightning and as such can create some surprising and powerful combinations. I will be more than happy to elaborate on this point.
Lighting is also neutral to
Water but in most cases the water provides a medium to increase the speed and power of lightning, being that water conducts electricity. Water/Lightning combinations are the most commonly used when using lightning. Again I will be more than happy to elaborate on this point.
Do you understand everything I've typed here (assuming you've read it O__O). There is no harm in asking questions and I will answer them with as much detail as you need.