How to create single post
Add a new Single Post Template
Go to WordPress admin panel > On dashboard sidebar navigate to Templates > Add new > Select Single Post type of template > Name your template (optional) > Click on Create Template button.
Design your Single template
You could use all the available widgets to insert Post Featured Image, Post Title, Post Meta Data, Post Content, Post Comments and whatever you need for your single post page. Let your imagination and creativity fly!
Attach your Single Post in the Customizer
Go to WordPress admin panel > On dashboard sidebar navigate to Appearance > Customize > Blog / News > Blog Page > Single Post Page > Standart Post Layout > Select your Single Post Template