Google Search Console (Google Webmaster Tools) is a web service provided by Google that allows webmasters to check indexing status and optimize the visibility of their websites.
To submit your sitemap to Google Search Console:
In the Website Editor, click Pages.
Find the Homepage, click the gear icon next to it and select SEO.
Copy the website sitemap link.
Go to webmasters.google.com and log in to your account.
Select Sitemaps from the side menu.
Paste your sitemap URL link and click SUBMIT.