Getting info for samba

Hi ppl.

can some one tell me where to find info on all those posibble setting in
samba. I am totaly lost.

I need to know this too: update encrypted and null passwords.

Please tell me where is help for all those option and what they mean.

Also I would like to know what is diference betwean 2.x.x and
3.x.x-alpha.
and beta.

Any help would just fine.

Regards,

Admir