Guest posting is a great way to get backlinks, both the blog and the author may benefit of this tactic: the first gets fresh content, the other can reach to an already established audience and get a back-link.
Guest posting in Spanish Speaking countries may not be the same as in English or any other languages. Each blog has its own set of rules and requirements, normally they tend to have a high-quality standard, but lower traffic.
Guest posts in Spanish are free, different from the Sponsored posts that may charge the business a fee for being published.
See this Guest Post that we wrote for a client some weeks ago in a very well known Colombian Blog:
Buscando la libertad verdadera me encontré que es mas difícil de lo que pensaba, pero a la vez muy fácil. He aprendido que no todos quieren escuchar la verdad, que muchos actuamos como el esclavo que recién sale de su esclavitud y ahora pide un trabajo a su antiguo amo. Y así como el Rey Desnudo, nadie se atreve a decirte la verdad. Descubramosla juntos.