There is no better way to learn about robots and electronics than building your own. We have covered many fun DIY electronics projects here in the past. Jaakko Alajoki has shared a video that should give you a better idea how to make a tea making robot with a LEGO Mindstorms EV3 kit.
The robot boils the water, pours it into a cup, and dips the tea bag. It’s not the fastest robot we have seen but still fun to try.