I looked through the forum and found only 5 years old post about custom keywords. So I open the question to clarify now.
I need to edit, first of all, keywords and description of the site. Which tools or technics should I use? Is it index.php in "default" folder and I should type everything I want there or I have special section in Admin Panel? Or maybe any plugin?
Could I make custom keywords for each exhibit on the site?
Nevertheless, thank you for your work, guys.