Getting used to Labview 'logic'

[joecloud]

Hello!
I'm fairly new to the forums- as a member. But I have been on here a lot in the past because it has always been a good resource for code and getting better with the electronics/labview.
Anyways, I'm trying to understand the 'logic' if you will- behind labview programming. I'm starting to get used to the idea of the VIs, and putting together block diagrams. But I'm clueless about structures. I haven't messed with them, mainly because I haven't needed to, but I've seen a lot of sample code for different things, even screenshots posted here on CD that include them. Can anyone explain to me the purpose behind them, and when to use what appears to be the different types of structures? (while loop etc..)

Thanks,