Very basic video for beginning PowerPoint 2013 users:
The Most Effective Use Of PowerPoint video by YourNextBestSpeech
This video explains how to add a YouTube video to WordPress.org (by competenowwebtips) with the YouTube Shortcode plugin. I used the instructions in the video to create this post.
You can insert a YouTube video by pasting the video’s URL into your post; but the YouTube Shortcode plugin gives you more options. It works really well!