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More likely you have error in config file. 

Go to /etc/apache2

and run the test

$ apache2ctl configtest

I will report the error line in your config file. 

To restart the Apache HTTP server, you can use the command-line interface. The exact command may vary depending on your operating system. Here are commands for some common operating systems:

On Linux (e.g., Ubuntu, CentOS):

You can use the systemctl command to manage Apache. To restart Apache, open a terminal and enter:

sudo systemctl restart apache2 # For Apache 2 on Ubuntu

sudo systemctl restart httpd # For Apache on CentOS

sudo apachectl restart  #On macOS

If you're using Apache on Windows, you can use the httpd.exe program to restart it. Open Command Prompt as an administrator and navigate to the Apache bin directory. Then, run the following command:

httpd -k restart

These commands will stop and then start the Apache web server, effectively restarting it. Make sure to run them with administrator or superuser privileges to have the necessary permissions to restart the Apache service.