Responsive Dictionary App

I want some feedback on how to add form validation in React because it is something that I have always struggled with. That's why you will see that I added an alert popup instead of proper form validation in this solution. Also additionally, if you guys can give some feedback on how to improve the code quality and efficiency of the current code that I have written that would be helpful. And of course, if you have some additional feedback other than this which would help me further advance my existing knowledge of React and overall frontend technology that would be helpful too. Lastly, a huge thank you to everyone who will take a few minutes out of their precious time and write their feedback here. You guys are great and I appreciate your help, perspective & feedback.