5. Use constants to avoid repetition.

6. Make sure such content-types exist in your Strapi application. Or replace/delete them in gatsby-config.js

{
      resolve: `gatsby-source-strapi`,
      options: {
        apiURL: `http://localhost:1337`,
        queryLimit: 1000, // Default to 100
        // contentTypes: [`jobs`, `projects`, `blogs`, ],
        //singleTypes:[`about` ]
        contentTypes: [`jobs`, `projects`, `blogs`],
        singleTypes: [`about`],
      },
    },