Please tell what you consider that a post editor should have?

Just your standard editor works fine.

Do you guys prefer to have the preview next to the editor?

I personally like having the preview next to the editor yes.

Do you thing a word counter with the estimates min of reading in post would

I'd love this.

be helpful? Like medium that shows the minutes it will take you to read a post.

I love knowing how long a post will take to read for sure! Just like how medium has it.

If I can would you like to be able to select the profile image of the post?

That would be amazing yes! plz :)