Tutorials for adding custom events to custom objects

I generally do not read the data written by others. CodeWhy? Tired! What this comrade gave is compressed! Khan... Test me, right? Also, the comrade did not give an example code, but said that the code is correct. I tried to crack it, but the brain cells died too fast! Before I became an idiot, I decided not to look down. Isn't it the support for adding custom events to custom objects? Let me write an example. Even if it is a tutorial, I can't understand it! I won't be stupid enough to write code for you to sell money!
Now, the code I wrote is as follows: Xmlns = "http://www.w3.org/1999/xhtml">