Do you want to show a youtube video within your blog post? Its called embedding a video within your post which is very easy because you can add a video, by just a small line of code.
Just go to any videos page on youtube.com, example this link
Then on the youtube video page you will find 2 sections which you can find from the following image that the Embed Code is available on the right side of the video post.
In this right section, you will find 2 options ie URL & Embed which have sub options like -
After making your selection, copy and paste the embed code above. The code changes based on your selection
Include related videos
Don’t include related videos
Just Copy the code from the above section and then add this code in your blog post in the ‘HTML’ mode and then click on publish and it works.
Here is a sample video :