Things you can post

A short list: audio, video, a picture, a slideshow (a series of pictures), even receive calls and voicemail! See blogger help for more.
Almost anything you can write in html code can also be included. It's not that hard. Look here.

Or when you're writing a post, click on Edit Html on the top right corner, and then click on Help in the topmost right corner. Then type HTML CODE into the search box. You'll find html tags that you can copy and paste into your post.

For more (simpler!) ideas, go to blogger help.