If you want to embed YouTube videos on your blog, then the best way to do this is with a plug-in. That way, you do not need to use the YouTube embed code in the WordPress editor, and if that code needs to be changed then the plug-in can take care of it.
Once installed, you only need to place the word “youtube” followed by a space and the video ID in square brackets at the relevant position in your post. The plug-in replaces this with the code to embed the video.
I want to try out some other video plug-ins on this site, so I won’t embed a video on this post at the moment. Instead, click here to see how a video embedded with this plug-in looks.