You can listen to feed's post type & author & title. You can ask for opening post details and commentaries. Here is detailed description of possible commands:
Say 'OK Google, talk to Reddit feed' to start.
Then, you can say 'read all feed' where word 'all' points to feed type. You also can say:
'read my feed'
'read popular feed'
'read original feed'
'read feed' or just 'read'.
You can say 'read top posts', where word 'top' define posts sorting. Here is list of some possible commands with different sorting:
'read top posts'
'read hot posts'
'read rising posts'
'read controversial posts' etc.
You can combine feed type and sorting in one request: 'read rising posts from popular feed'.
While you listening to selected feed type with selected sorting, you can interrupt you Google Assistant just within pause after post title by saying 'OK Google, open', this command will open last read post.
Also you can choose post to open by saying 'open first | last | second | third | fourth | fifth' at the and of post titles response.
As content of this action is user generated, it can contain mature words, phrases, etc.