To ensure that search engine crawlers can locate and read your robots.txt file, you should place it in the root directory of your website's server. The root directory is the main folder where your website's homepage (e.g. index.html) is located. Here's the typical file path:
It’s vital that you make sure that the robots.txt file is accessible via a direct URL and that there are no restrictions or password protection in place that might prevent search engine bots from accessing it. This placement allows web crawlers to easily locate and follow the instructions contained in the robots.txt file to determine which parts of your website they can crawl and index.