An alias is a line the shell puts in place of a name, before it reads the line as a line — so an alias may hold a pipe, a redirection, anything. With no arguments it prints the ones there are.

ll, la and flake come from ~/.zshrc, which is where yours would go if this shell had somewhere to keep them past a reload. type says what a name is aliased to, and an alias cannot expand itself, so alias ls='ls -l' is safe.