Software development related knowledge: You need to know the basic knowledge of software development, such as programming language, development framework, data structure, etc. Master many programming languages, such as Java, Python, etc. So that you can develop fully functional applications.

User experience design: To develop beautiful, easy-to-use, fully functional applications that can meet the needs of users, we need to master the principles of user experience design. Please make sure that the interface of the application is simple and intuitive, easy to navigate, and in line with user habits.

Database and server-related technologies: In order to store and manage a large amount of user data and content, it is necessary to understand database and server-related technologies. At the same time, we should also understand cloud service technologies, such as AWS and Google Cloud.

Video streaming and picture processing technology: It involves the technology of video and pictures, and it is necessary to understand related technologies, such as face recognition, image processing and audio analysis.

Network security: In order to ensure the security of applications and user data, we need to know the relevant knowledge of network security, such as encryption technology, firewall, DDoS attack defense, etc.

In a word, developing and designing a more advanced and superior Q&A APPlication app than Baidu Post Bar requires extensive technical skills and knowledge. In addition, we also need to pay attention to market demand, user feedback and the latest technical trends in the industry, so as to continuously innovate and provide quality and comprehensive services.