How to redirect the old links to work new?

With HTTP I figured out, now I would solve the problem with HTML at the end of old links …

You can use a regular expression to redirect .html URLs – https://redirection.me/support/redirect-regular-expressions/

And where exactly can it be inserted?

I understand this is my option?

Redirect .html pages in a directory

https://oldsite.com/blog/post-name.html ? https://newsite.com/post-name/
Source /blog/(.*?)\.html
Target /$1/`

You create a redirect for it. You can find general information about using the plugin here:

https://redirection.me/support/

I do not really understand … I know that it is very simple, but I do not understand what to choose that this procedure is qualitatively executed. Help me please.

What have you tried? Have you read the support site I linked to? If you follow the instructions it will become clear, and you will then know how to create a redirect. Once you can do that, the regular expression guide tells you what to put for the source and target.

I understood how individual links can be corrected, but I can not understand how to fix all the old links, the end of which ends on HTML

What have you tried?

You can create a regular expression, using the details from the example given, which will redirect all URLs ending in .html. Have you read the support site I linked to?

How to create a redirect: https://redirection.me/support/create-redirects/

I read, but I don’t understand something, it seems to do, but the redirection does not happen

Made in this way:

/sample-post.html/
https://vinegred.ru/sample-post/

Ok, that’s not what the example says. You need to create a redirect:

Source: /(.*?)\.html
Target: /$1/

You have created a redirect:

Source: /sample-post.html
Target: https://vinegred.ru/sample-post/

They are different

/(.*?)\.html
/$1/

This will be enough?

Also saw these lines in the instructions, but did not try to insert them.

https://drive.google.com/file/d/1y2G3OaN9jN6fv-o2-oYUFvbAk22shNoC/view?usp=sharing

Made in this way, but when checking gives an error, what’s wrong?

The warnings in your screenshot show potential problems. You should enable the regex option, and check the documentation about redirecting .html.

Where can “check the documentation about redirecting .html”?