Tell me please. Is it possible to make your own banner image with a link so as not to use advertising plugins?
AI-generated summary
R2BB1T wants to create their own banner image with a link without using advertising plugins. They’ve tried available plugins but none suit their needs, specifically with connecting to https://partner.yandex.ru/. R2BB1T explains they want to place a custom banner code (<a target="_blank" rel="nofollow" href="/">...</a>) directly on their site.
Lilly welcomes R2BB1T and suggests using a banner theme component like Versatile Banner or Welcome Link Banner. Alternatively, Lilly recommends exploring other plugins, such as House Ad Templates or Discourse Advertising. For those interested in learning about Discourse development, Lilly provides resources to get started.
Welcome 
If I understand well, you want to be able to insert your own content between posts?
advertising banners, your own pictures with a link
None of these plugins suits me. I use https://partner.yandex.ru/, but it cannot be connected through the available plugins. Therefore, I want to place my banners in the form <a target="_blank" rel="nofollow" href="/"> <img alt="/" src="https://ibb.co/ZL7QX1n" width="728" height="90" /> directly on the site. How can I do it?
Hi @R2BB1T Welcome to Discourse Meta 
You could make your own ad banner by using one of the many banner theme components like these ones:
There are also some other plugins that may interest you:
If you are interested in learning about Discourse development, then you may want to start here and here.