All browsers can’t open any website

Try a SafeBoot https://support.apple.com/en-us/HT201262

Takes noticeable longer to get to the login screen, does a 5-15 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc. Login and test. Reboot as normal and test.

To get a good look at your System config. for conflicts or issues, you can run this utility http://etrecheck.com  

If you need help interpreting the report you can post it here in its entirety in the "Additional Text" box in the edit toolbar below.

or

I suspect you have installed adware/malware. Try running this trusted utility https://www.malwarebytes.com/mac/

kmohab wrote:

I entered and exited safe mode for several and the problem was solved.

Thank you a lot for your help

Good computing kmohab !