This tutorial is a short intro about web development and google apps script.
Google apps script is a good tool and lets us use forms and sheets, also can be used with google site and any website.
After you write the source code in the google apps script for web development, you can deploy it to your website.
For the deploy feature, you need to select the type of deploy action.
The last step is to use it into website.
For example: If you use google site webpages the easy way is to embed with URL result by deploy settings.
This is very useful when you want to fill a form from the website with data and send it to your Spreadsheet on google drive.