Click on the Posts button in left menu a than on Add New
Add post title
Add post content
Choose post category(ies)
Select a featured image / 4a - Set featured image caption visual options (img. 1.3)
Exerpt is optional part of the post. When you fill, it will be displayed as a caption in hero image (img 1.5)
Add post tags
Choose related posts (related posts are posts which are displayed on the left side of the post on a front-end part /img. 1.4)
Choose annotations
Publish post by click button Publish
When post has series posts you can choose by add series (img. 1.6)
In case you want add embeded video fill
URL. Other inputs are optional
1.3 - image caption visual options
1.4 - Related posts
1.5 - Exerpt
1.6 - Series