Error solution with REST API “The response is not a valid JSON response” WordPress+Nginx

Once I installed WordPress on an Ubuntu Server operating system with a Nginx web server and when I tried to add a new article I saw an error:

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WordPress update error solution “Briefly unavailable for scheduled maintenance”

There was a case once a long time ago, when updating WordPress an error occurred and it turned out that the update did not install and the site remained off.
When it was opened, it was displayed:
“Briefly unavailable for scheduled maintenance”.

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WordPress. Solution “cURL error 60: SSL certificate problem: unable to get local issuer certificate”

Once on one of the sites I noticed in WordPress the menu “Tools” – “Site Health” the following errors:

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