Skip ERD in database implementation AS we know that entity relation diagram(ERD) is an important concept in database implementation, But I was wondering that can we skip this step when creating a small database containing a few tables i.e directly create tables in RDBMS in order to save time. or I should do all steps for better understanding i.e draw the ERD and then implement in RDBMS ?? Although it is a small database. 

Just asking this question for general knowledge as I am new to this field.
The ERD is simply a product of the database design phase. You can skip drawing the ERD if you can complete design in your head, but you cannot (should not) skip designing your database.