How to use 'embed' feature properly.

Hello friends, please guide me with it. Whenever I use the embed feature either in forums or announcements, it doesn't work anytime. So please tell me that how to use it properly.

Do you mean inserting chess games?

Or videos

https://support.chess.com/article/1060-how-can-i-embed-a-video-in-my-profile

How can I used embed feature to insert google forms or spotify playlist, like these stuffs.

I dont think you can embed a spotify playlist, but you can do it for google forms

You can't embed Spotify playlist but I think you can do it for Google Forms. I have seen Google Forms' embedded. I just don't know how to do it.

Could you do it here please, I wanna see an example of it.

Have you tried getting the embed code from your source?

Yes but didn't work. It appears blank in white box.