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The phenomenon of code mixing is not only found in society, but also on social media such as YouTube. One of the YouTubers in Indonesia who often uses code mixing is Jerome Polin. Jerome Goes to School is one of the contents in his YouTube video, in that content he uses code mixing to communicate with his interlocutors or his audience. Code mixing has three types, namely, insertion, alternation, and congruent lexicalisation. The purpose of this study is to identify the types of code mixing used in Jerome Polin's utterances. This research uses Muysken's (2000) theory to analyse the types of code mixing. The data source for this research was taken from a video on Jerome's YouTube channel called Nihongo Mantappu. The data comes from Jerome Polin's utterances in YouTube content videos. Researcher investigate two data videos from the youtube channel. The first video is entitled Kaget! Di Kampus Ada Stadium!? Keliling Univ No.1 Taiwan(NTU)| Goes to School. The second video is Akhirnya!! Wasedaboys Ke Cambridge University! Campus Tour Naik Kapal!? | World Trip 6. This research uses descriptive qualitative method, the researcher collected data, made analyzes, and made conclusions. The results of this study found a total of 74 code mixing data. The most common type found is insertion and the least type is alternation. Insertion was found  69 (93.24%) data, alternation 1 (1.35%) data, and congruent lexicalisation 4 (5.41%) data.

This research aims to discuss the application of cognitive learning theory in the learning process in elementary schools. The main focus is on how cognitive approaches can improve students' understanding and skills. The research methods used were literature studies and field observations in several elementary schools. Cognitive learning theory was developed by experts such as Jean Piaget and Jerome Bruner, who emphasized the importance of internal mental processes in understanding information. Piaget described four stages of children's cognitive development, while Bruner emphasized discovery-based learning. The research results show that a cognitive approach to learning can increase learning effectiveness, student motivation, as well as critical and creative thinking abilities. Students taught using cognitive methods show active participation in class activities, increased understanding of the material, and higher academic scores compared to traditional learning methods. Teachers report that this method helps students develop higher-order thinking and problem-solving skills. The practical implications of this research suggest that cognitive learning methods should be widely applied in elementary schools to optimize students' learning potential.

Deixis is a word that refers or leads to something that is influenced by the speaker's situation, deixis has a function according to its respective reference according to the context. The purpose of the research is to describe persona deixis, place deixis, time deixis, discourse deixis, social deixis in conversations on the Nihongo Mantappu YouTube channel. The method used in this paper is descriptive qualitative method. Based on the analysis, the researcher has found 4 forms of deixis in the data that has been studied, these deixis include persona deixis, place deixis, discourse deixis, and social deixis. The most frequently used deixis is discourse deixis in the form of this word. The use of discourse deixis is most often used because Jerome Polin or his friends more often mention this word because it refers to the discussion discussed, namely the Indonesian writing and speaking test by foreigners or foreigners. Each deixis found has its own function depending on the context. The research that has been done is interesting because the videos analyzed have sources from abroad and the benefits of this research are expected to help readers understand what deixis are found in the videos that researchers analyze.