Their attitude towards donations: if you feel that you've benefited from the course and would like others to be able to do so in the future then you can give a donation. The donation shouldn't be given for the purpose of paying for the benefits you've received.

IIRC they don't ever explicitly ask you if you want to give a donation. At the end of the course there is a visible table set up where you can give donations if you want to. They also have forms you can fill out if you'd like to get emails about volunteer opportunities.