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Sure, I'll try to explain these codes line by line. Here is the code in a code block:

// This function defines the setConfig method
setConfig() {
    // This line tells Express to use a middleware function for serving static files
    app.use(express.static('public'));
}

The app.use() function adds a middleware to your Express app that runs before your route handlers. A middleware is a function that can modify the request or response objects, or perform some other tasks.

The express.static() function returns a middleware that serves static files from a given directory. Static files are files that do not change, such as images, CSS files, and JavaScript files. For example, if you have a file called logo.png in your public directory, you can access it by going to http://localhost:3000/logo.png.