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One of the easiest ways is to use Google’s Programmable Search Engine service, which allows you to create a custom search engine that searches only the sites you specify. You can also customize the look and feel of your search engine and integrate it with your website. You need a Google account and follow to create a Programmable Search Engine.

This steps:

Sign in to Control Panel using your Google Account.

Add the pages you want to include in your search engine in the Sites to search section.

The name of your search engine will be automatically generated based on the URLs you select. You can change it later if you want.

Select the language of your search engine.

Click Create.

You can also use other tools or platforms to build your search engine, such as WordPress plugins, Algolia, Elasticsearch, etc. However, these may require more technical skills and resources than using Google’s service.