Hello everyone!
I'm a pretty familiar developer with joomla
But sometimes the problems of joomla that I encountered also make me quite confused.
 

The menu refers to this.
 
 
E.g:
 
Sometimes the menu settings are clear
But the URL is wrong
For example, the URL generated when the URL is generated in the foreground will be 404 instead.
 
Usually happens when re-adding or setting menus
So I looked for some articles and saw the following

 

 
Mainly said
If you encounter this menu inexplicably wrong
Can click Rebuild button
 
 
Of course this is not a panacea
But it does solve most of the problems
For your reference! Thanks!