1. School of Stomatology or Stomatological Hospital: You can go to the School of Stomatology or Stomatological Hospital to learn dental filling techniques. These institutions usually provide education and training in stomatology, including courses and practices in dental filling techniques.

2. Professional training institutions of stomatology: There are some professional training institutions of stomatology in the market, which can provide courses of dental filling technology. These institutions are usually composed of professional dentists and teachers, and provide systematic training in stomatology knowledge and skills.

3. Online learning resources: You can search online learning resources through the Internet, such as video tutorials, online courses, stomatology forums, etc., to understand the filling technology and related theoretical knowledge.

No matter which way you choose, it takes a certain amount of time and energy to learn dental filling technology, and you need to master relevant theoretical knowledge and practical skills. At the same time, you need patience and enthusiasm, and constantly learn and improve your technical level.