I had the mistake in the part of my first message about second case.
I have not double category. It’s a misspell.
I need to make working this url: /blog/expert-articles/how-internet-marketing-increases-business-sales/
But if i add “blog” in custom permalink, then it doesn’t work.
This custom permalink (/blog/%category%/%postname%/) breaks article’s link and it stops to open
However, this link works “/blog/expert-articles/”. I can’t understand what the matter is
