1. index (데이터가져오기)
https://www.youtube.com/watch?v=7Pl5T5jf3Kk&list=PLRheCL1cXHrsVMqY-ZFuEaHIjPB7xcnli
2. store (데이터 삽입)
https://www.youtube.com/watch?v=YxTErC4a7sA&list=PLRheCL1cXHrsVMqY-ZFuEaHIjPB7xcnli
3. edit updata (업데이트_
https://www.youtube.com/watch?v=V7v8zWexpQ4&t=923s
4. delete (삭제)
https://www.youtube.com/watch?v=I-B9TvjukLg&list=PLRheCL1cXHrsVMqY-ZFuEaHIjPB7xcnli