Lightning types and how they form

There are a number of different lightning types - but how exactly do these lightning types form and what makes them different?

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[sanjaysimon]

Great Clip, Hope you could make a movie on Electric current from Thunder lighting and their research.

[mrsoft]

Cool.We got a few good shots from our storm on the 17th!

[izwanibrahim]

It's weird that I just discovered lightning appears to be a square shape. I'm trying to find out about this type of square shape lightning on the internet but can't find any of it.