If you add a new page or post to your website, there is a very good chance Google will discover it… eventually. It could take a month or two or it may not get listed at all depending on your website’s settings.
To get your new page listed instantly sign up for Google’s Search Console and add your site if you have not already done so.
Add the URL of your new web page in the box labelled “Inspect any URL in…”

If it is a new page then it will almost certainly say that your URL is not in Google.

Click the “REQUEST INDEXING” button.

After a minute or so Google will inform you that your page has been submitted to a priority crawl queue.
That’s it, now go and make yourself a cup of tea.