Ello keyboard shortcuts to make note of (from @scobleizer, quoting @cc and @teno):
Shift+0 toggles notifications in your feeds.
Shift+1 toggles the feed itself (either turns it off so you can see who you're following, or turns it back on so you can read)
Shift+5 toggles your view of the feed (grid or list)
Left/Right Arrow toggles the left sidebar (Right = close sidebar, Left = reopen)
Now to start actually posting my own content at some point... :)