In a WordPress theme, the <head> element goes in the header.php template, which you can then include in your pages using get_header(). But you can't hardcode the <title>, or it'd be the same for every page.
WordPress provides built-in support for dynamic titles. To enable it, add the following line to your functions.php file:
add_theme_support('title-tag');Once added, make sure you remove any hardcoded <title> from your header.php file. WordPress will now generate the correct title for each page based on the title set in the editor. For the home page, it'll use your general site settings.