This format perfectly fits in case you need only a single image for your post display. Use Featured image option to add image to the post.
Pellentesque habitant morbi tristique...
If your post contains video, please use this format. Select Video format in the appeared metabox and add the embed code from the video hosting you use (youtube,...
If your post contains audio, then you should use this post format. Select Audio in the appeared metabox and add link to your mp3 file.
Pellentesque habitant morbi tristique...
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed blandit massa vel mauris sollicitudin dignissim. Phasellus ultrices tellus eget ipsum ornare molestie scelerisque eros dignissim. Phasellus fringilla hendrerit...