Ads into post

Hi miknik. Which banner? In the single post? Home page? Other pages?

Banner in single post thanks ??

If you’re referring to the Featured Image, you need to set a Featured Image for the post, then set the post format to Image.

I want to insert adsense banner at the top and at the bottom of single post.

The easiest way to do that is to use a plugin. Here’s one made for Adsense by Google:
https://www.shoutmeloud.com/best-adsense-plugins-wordpress.html

And here’s an article that discusses several others:
https://www.shoutmeloud.com/best-adsense-plugins-wordpress.html