Inactive , missing block / typing box

Hi every one. I’m learning WordPress (php) through a cors. we have created a personal theme. in this point of lesson , I have created post type event and programs. but when I want to create new event or program , there is no empty box for typing my text.Just I can see excerpt box which I have created it. I don’t know if I’m writing in the right forum but could you please guide me to solve this problem? thanks