Hello! It's really an important topic, when it comes to the design and the decoration of our homes (and even halls, castles, etc.) Doors are one of the most important parts of every building (houses, villas, apartments/flats, kindergartens, schools, colleges, universities, castles, zoos and so on).
If you want to know concretely about door design, stylish doors, interior doors, exterior doors, door locks (and many more), I may recommend you this website: https://doordesignlab.com/
. It's very interesting, helpful and full of information about all of these. When you need a door, you can choose it by style, by design, by coating and so on. The good thing is that there is 2-year warranty. All their interior doors are covered by 2-years limited manufacturer's warranty. (You can download warranty by following a link below over there. If you'll have any issue with products and you believe that it falls under warranty case you can file a claim there, too. And they're having free samples, as well. :) I hope it'll be helpful for you to learn more about the doors and to have a good door when you need it!