Choosing and implementing the most appropriate method and materials to foster the learning of a second language is a challenging process. This dissertation provides some insights into the process of Second Language Acquisition and how two opposing teaching methods can favor this process. The first one is the Natural Approach supported by Stephen Krashen, which poses five hypotheses for language acquisition to keep in mind. Even though all of the hypotheses are important, it is a good idea to draw attention to the comprehensible input, the optimal input, and the affective filter because any of them can lead to a successful or failing class. The second one is the Audiolingual method, which more dynamic and effective communicative methods have surpassed, it still contains some elements that may continue to be exploited, especially if they are combined with other methods. There is also an overview of multilingualism, with the aim of reviewing different perspectives that learners of English as a third language may have. A deeper view of teaching strategies to children and the most appropriate materials for them is reviewed to offer a variety of ideas to be implemented with children, regardless of the level of English or age the students have. However, it is recommended to choose the one that appeals to the teacher the most and adapt it to the students’ needs. This analysis poses some possible recommendations for teachers to get the maximum benefit of teaching materials for the sake of creating the best possible learning environment.