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Abstract
This study centers on the exploration of the theories of second language learning and their applications. Three research purposes and three research questions guided the study. The significance of the study was also slated. Three main theories and their intricacies were explored. These theories include: Krashen’s Theory, behaviourism theory (operant and classical conditioning) and social cognitive learning theory. The learning applications as well as implications of the aforementioned theories were as well highlighted and related to learning environment. The study recommended among others that the learners of this study should strictly imbibe the knowledge in this study in both teaching and learning the English language as second language. It is therefore conclusive that this study has enough information that can ameliorate the stressful process of acquiring a second language. Keywords: Learning, Language, Krashen’s Theory, Behaviourism Theory, Second Language.