Google Domains Configuration:

1: Login into Google Domains account.
Go to “Configure DNS” tab and add ns01.000webhost.com, ns02.000webhost.com as “custom name servers” as shown below.
Also add a “custom resource record” as below. The “Data” column should be the url of your website on 000WebHostApp.com

000WebHost Configuration:

Login into your 000WebHost account. In your website 000webhost panel, go to Set web address -> Add domain.
Enter your domain name and click Park domain

If your nameservers are pointed correctly to 000webhost nameservers, domain will show status Ready which means that is ready to link Website.
Click Manage -> Link website.

Website Admin configuration:
Login into your website \wp-admin. Go to Settings=>General. Update the “WordPress Address URL” and “Site Address URL” to your website’s url.