Magento 2.4.3-p1 Installation follow same steps as Magento 2.4 Installation, Please follow below URL link.
Other important Magento 2.4.x issue as below
Magento 2.3 To Magento 2.4.5 Comptibility For PHP, MYSQL, Composer, Apache etc
Magento 2.4.4 Installation Steps
Magento 2.4.3-p1 Installation Steps
Magento 2.4.3 Installation Steps
Magento 2.4 Two Factor Authentication
Magento 2.2, Magento 2.3, Magento2.4 Installation Issue on Windows 10, XAMPP
Magento 2 Installation at 51% Error: (Wrong file in Gd2.php:64) Module ‘Magento_Theme’