Sudoku solver project feedback

Hello there :smile:
I managed to get this project in the bag after hmmming so many times and i would love your feedback on it. What is good about it? What could have been better?
A word of advice: don’t waste your sleep over x-wing, y-wing, swordfish and other sudoku techniques, this challenge is about simple sudoku puzzles.
Thank you and keep pushing :muscle:

Repl: Project
Code: Source code