There may be some tricky parts involved, and to avoid spending hours, this steps might give you some help, to install Redis Cache for PHP-8 on linux/ubuntu OS.

1. Install Redis system-wide: https://www.digitalocean.com/community/tutorials/how-to-install-and-secure-redis-on-ubuntu-18-04
2. Then install redis php-extension using (now industrial-standard declared) pickle:
   pickle install igbinary
   #then add extension=igbinary.so in php.ini
   pickle install redis
   and read that Github page to read use-case examples.

Note: if using docker WSL, you might need “supervisor auto” instead of “systemd”, or manually start by: `sudo service redis-server start`