CSS grid, CSS flex, React

What challenges did you encounter, and how did you overcome them?

Whatever I encounter I googled it and asked GPTchat

What specific areas of your project would you like help with?

With mobile version and tablet version. Can't figure it out, it looks different for every screen. Do I need manage variety of deferent resolutions or there is other way to manage it? Also I probably shouldn't have create a function for every changeable item in a page.