Hi. excellent questions you've asked here, thanks.

You can chat on chat.golem.network

Here's some FAQs https://golem.network/documentation/faq/

and 

https://golem.network/documentation/02-risks/

Golem is a project in the early stages. 
>Warning
Golem Project is a work in progress. Current version is an alpha stage of Brass Golem and it's not fully secured. Check this list of issues for more details. Please be sure that you understand the risk before installing the software.
[source](https://github.com/golemfactory/golem)

Some useful information https://github.com/golemfactory/golem

Personally I haven't used it yet, so I can't answer the questions about security.