To add YouTube to a post, use the shortcode “embed” youtube URL “/embed” (tags in square brackets)
To add a poll to a post, add a poll in the “Polls->Add Poll” Dashboard item. Note the poll ID. Then link to it in a Post with the shortcode “poll id=the_poll_number” in square brackets (where the_poll_number is the number defined in the dashboard).
Another cool thing is the page break. Check this out:
The Boston Bruins return from the All Star break 29-18-5 for 57 points, fourth in the Atlantic and first in the wild card. Tonight they take on the Toronto Maple Leafs (17-22-9 43 points) at TD Garden. The Bruins are 11-13-2 at home; with games against Toronto and Buffalo this week at the Garden, their home record should improve. Toronto is 10-14-2 on the road and 1-7-2 in their last ten.