Handwriting recognition algorithm that takes feedback?

I'm developing an app that can help people that make sloppy handwriting convert their handwriting into text. I'll probably just use it for myself, but I might spread it around the Internet too.

I'm creating it with Electron. I need a JavaScript library (or a few libraries that will help me achieve the result) that can process a picture of someone's handwriting, then use that information for handwriting recognition.

I think I could have the user write out the alphabet one-by-one, each letter instructed to be written by the computer individually, and let the AI try to recognize the letters when they're writing a real sentence using image processing, although I don't know a good library for that either.

Furthermore, I want the user to be able to tell the computer if the computer got something wrong, and be able to tell it what they actually wrote out, so that the computer can decide if it needs to ask the user to write out more of their handwriting to further train it. - I didn't clarify it earlier, but this is one of the most important things I need to be able to accomplish.

As someone in the comments suggested, I could look into the technology that the Apple Newton had used, but I still think my idea might be interesting to experiment with.

I do not have any experience with AI, so if someone could give me any guidance on where to get started with this, I would be very grateful. Thanks! I don't want someone to do it for me - I just need some guidance on where to get started.

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