How do I replace an arduino on a project i saw on instructables with a raspberry pi?

https://www.instructables.com/Ottis-Robot-the-Arduino-Robot-That-Can-Walk-and-Pe/

arduino uno specifically

i want to do it to mainly add an ai chatbot feature to the bot

help with that would also be immensely appreciated

To implement the AI Chatbot feature you need an internet connection, or at the least connection to some device that can handle processing prompts, as an Arduino cannot withstand the processing power needed to do AI things internally, thus an external source of processing is needed.

Everything else is quite simple, good project tbh.