Hehe, I am similar to you, and I also transferred from java to DBA. I went to Dong Peng Oracle Bone Inscriptions Training Center and consulted many schools at first. Dong Peng was chosen because the quality of their courses was 8% wrong. The teachers were experienced old DBAs, not those who followed the book. Moreover, they taught in small classes, and the class quality was very good, which was incomparable to the students in large classes. That's basically all. You can search for details.