Typing space should open the first card shown. r should reset filters. 1 to 6 should trigger the 6 example filters.

The cool thing would be to have ? bring up a modal showing the shortcuts, as works with Gmail and Google Calendar. Of course, you're right about space; return would be a better choice. Interestingly, esc already works to dismiss the modal.

As a new user I want to be introduced into the usage and features of nivio by an interactive guide.

maybe use something like https://github.com/elrumordelaluz/reactour