Abstract-Dewata Nawa Sanga in Hinduism has an important role as the foundation of the religious concept implemented by Hindus in Bali, Indonesia.

- In early 2020 various parts of the world announced a pandemic status due to the Covid-19 outbreak caused by the Corona virus. Indonesia is one of the countries affected by this epidemic. The public is urged to implement health procedures such as taking vitamins, basking in the sun, doing physical distancing, staying at home, working from home, Study from Home and so forth. Almost all sectors were paralyzed to minimize the spread of the covid-19 virus. Starting from the tourism sector, the economic sector and even the education sector. The Education Sector, which in its application must run classes in an amount that is not small, must also be limited. Academics and students in various regions in Indonesia are prohibited from traveling on business trips, out of town or even going to schools or educational institutions. One technology that has the potential to be used as an Education medium is Augmented Reality. In the past few years Augmented Reality has launched educational media products for Education in various sectors. In this journal, we will study about augmented reality-based Education media applications that can be used to study at home or Study from Home, so that it can improve physical distancing or reduce mass gathering to help the government in tackling the covid-19 pandemic.

Nowadays sales marketing strategies in showrooms are increasingly innovative. Utilizing information technology, especially data mining to obtain customer habits in shopping. Customer's shopping habits are recorded in each transaction and stored in a data warehouse. This transaction data is actually very valuable and can be elaborated to be used to manage cross selling and up selling in sales stores, including IT showroom stores. IT Showroom stores usually have unusual or unexpected customers shopping for IT needs. Therefore this potential can be exploited for analysis to get behavior from customers by analyzing transactions in a certain period of time using the Rapidminer application. Rapidminer is a fit application to solve this problem because it is equipped with various algorithms, one of which is association rules. Association rules are algorithms that can be used to analyze data and produce recommendations for cross selling and up selling.

The culture of Hinduism in Bali is very preserved and maintained by the Hindus in Bali to remain dignified. Dewata Nawa Sanga is one of the Hindu Religion Concept embraced by the Hindus in Bali. Dewata Nawa Sanga means nine deities as a manifestation of God in charge of guarding and controlling the nine wind direction. The application of Augmented Reality Dewata Nawa Sanga developed to increase the knowledge of Hindus in Bali about the concept of Dewata Nawa Sanga, through a learning medium considering the importance of Dewata Nawa Sanga for Hindus in Bali. The application of Augmented Reality Dewata Nawa Sanga developed using the markerless method, so users simply rotate the Android devices to see the position of Deity in the nine wind directions and to know the information of each of the deities. Application of Augmented Reality Dewata Nawa Sanga provides education about detail elements about each Deity in nine wind direction through Information View feature in narrative form. The resulting application indirectly educates the user to know the direction of the controlled and guarded by nine Deity as a manifestation of the god through Augmented Reality display by using gyroscope sensors.