having different page titles on individual posts

This is done in the header.php file…

You can see an example here:
https://www.ladydelaluna.com/general/notice-to-internet-explorer-users/

<title>
<?php wp_title(' '); ?>
<?php if(wp_title(' ', false)) { echo ' -'; } ?>
<?php bloginfo('name'); ?>
</title>

thanks ladydelaluna, that helped me