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Creating a blog page is simple.
Create a New page
In the page editing page, on the right in “Page Attributes” under “Template”, select “page with posts”
Make sure the site is not configured to use the default WordPress blog page by going to Settings > reading
There, make sure “Your Home page displays” is set to a static page, and that nothing is selected in”Posts page”, showing –select–
Then create some posts, and they will show up on your blog page.