Security?

Hi People,

Having used Joomla in the past and no doubt like many of you, I would like to know what security specific information newbies like me should be aware of?

How often are we looking to update / upgrade our versions, do you do small security fix updates between major 1.2, 1.3, 1.5 for e.g. 1.5.1 which would have some security updates from found vulnerabilities?

I just want to make sure I and other newbies are fully aware of what we are required to do, to keep our installations as secure as possible and the wider elgg network?

Regards,