[Dioni]

Maybe a stupid question but..

I just don't get the whole weighting stuff...
I read the whole beginner site, the book of pelizzari but..:

How do you know how much weight u need for a certain depth? how do you calculate this? what are the positive aspects of this? is it bad to dive without weight? Are there sideaffects if you dive with or without weights?

I never did a serious CWT.. just a 6-7 meters deep CWNF when i was younger..

Just really beginner questions, but it has to do with CWT so i'll post it here..
( Mods.. if it's better in the beginner section, i'll post it there)

Thanks in advance you guys..

peace.. DIONI