On macOS Ventura:
echo "alias ll='ls -la'" >> ~/.zshrc Don't forget to close and reopen Terminal after that.
As it's explained in the article:
Apple has changed the default shell to zsh. Therefore you have to rename your configuration files. .bashrc is now .zshrc and .bash_profile is now .zprofile.
The difference between .bash_profile and .bashrc files explained in this article.