I tried yesterday, trying again today but I'm no professional programmer and this is over my head, would love some help to update this on console please!

If I get:

Error: The repository 'https://ppa.launchpadcontent.net/ondrej/php/ubuntu questing Release' does not have a Release file.
Notice: Updating from such a repository can't be done securely, and is therefore disabled by default.
Notice: See apt-secure(8) manpage for repository creation and user configuration details.

When running sudo apt update, how could I update to one of the safe php versions?

I tried

sudo add-apt-repository --remove ppa:ondrej/php
sudo add-apt-repository ppa:ondrej/php
sudo sed -i 's/oracular/noble/g' /etc/apt/sources.list.d/ondrej-ubuntu-php-oracular.sources
sudo apt update

from: https://askubuntu.com/questions/1530400/install-older-php-versions-on-24-10 but I get sed: can't read /etc/apt/sources.list.d/ondrej-ubuntu-php-oracular.sources: No such file or directory