How to create an application that optimizes and displays the input text by AI.

Hello! My name is Sachi and I am a university student in Japan. I am a university student in Japan.

I have just started using Retool because I want to create an app for thoughtful text communication. Specifically, I want to make an app that corrects the text I type if it lacks thoughtfulness, as shown in the title.
Once that is done, I think it would be even better if there were options to give advice and create a response based on the relationship with the person you are communicating with.

However, I am new to Retool, and I am having a hard time learning it because of the English language.
So I was wondering if you could give me any tips on the study and workflow required to make this app, or any tutorials or articles you would recommend that might be helpful.

I am having a very hard time. I would be very happy to hear from anyone who is kind enough to help me.