For Assets, the path is relative to the executable not the cpp file in which the file location is used.
https://www.sfml-dev.org/tutorials/2.5/graphics-vertex-array.php
Composition over inheritance in object-oriented programming is the principle that classes should achieve polymorphic behavior and code reuse by their composition rather than inheritance from a base or parent class. This is an often-stated principle of OOP, such as in the influential book Design Patterns.
Install sfml on ubuntu
sudo apt-get install libsfml-dev
Install lua on ubuntu https://www.tecmint.com/install-lua-in-centos-ubuntu-linux/