From simple to complicated:
1. implement a search engine of mulit-platform (mainly website), please refer to www.pi-apple.com
2. implement a search engine which can analyze text of mulit-platform (mainly website)
3. implement a search engine which can tag image by AI of mulit-platform (mainly website)
4. implement a search engine which can search text and image with natural language of mulit-platform (mainly website)
5. implement a chatbot which can search text and image with natural language of mulit-platform (mainly website)