WordPress makes it easy to share video from sites like YouTube by including them in the context of your post or webpage.
1. Copy (highlight the text and CTRL-C on a PC, Apple-C on a Mac) the URL of a video from a site (ex: YouTube)
2. While editing a Page or Post, click the place within the text you want the video to appear
3. Paste in the URL for YouTube (not the embed code, just the URL itself)
Once you publish the post (or preview it) you should see your embedded video.