How do I know the difference between Definite and Indefinite Articles in Spanish

So, basically, a Definite Article in spanish, is something you know, for example, "El chico" is "The boy", he is someone you know, and a Indefinite Article is something or someone you don't know, for example "Un Bolígrafo" is "A pen", it's not The Pen. Please, if you don't understand it let me know it. Thanks :).

Explanation:

So, basically, a Definite Article in spanish, is something you know, for example, "El chico" is "The boy", he is someone you know, and a Indefinite Article is something or someone you don't know, for example "Un Bolígrafo" is "A pen", it's not The Pen. Please, if you don't understand it let me know it. Thanks :).

1.) la ruta arqueologica

2.) la ruta artesanal

3.) la ruta paraiso artesanal  

4.) la ruta de las flores

5.) la ruta sol y playa

6.) la ruta de la paz