I have a doubt. That way I can create a category where Guests can see and write messages.
The default Guest role can only be used to view content. This is a special case.
I know you can set category permissions on the role level, but I don't think what you want is possible without coding some modifications.
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guests mean they don't have usernames or ids's when viewing. Therefore to allow anonymous posting use the anonymouse plugin if you don't want guests to register as a member.
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.
@peregrine I forgot about that plugin. XD
It's just what I needed :-D Thanks!