How to insert a banner to the mainpage using code?

Hi there!
I have a WordPress site, and I need to insert a banner to the bottom of the main page. Is it possible to insert it without plugins using only code? How can I do that?
I was looking for the appropriate thread on the forum but didn’t find it. Please, help!
My site:


You might want to read this:

Method 4 shows how to edit the footer.php code. You could add a banner there.

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