Rule 1 : After the verb "Enter" the preposition "into" should not be used Except when it is used with reference to agreement or conversation.
Ex- He entered the premises without any permission.

Rule 2 : After transitive verbs such as 'Discuss/Describe/reach/order/tell/demand/attach/resemble/ridicule etc. no preposition is used. The verbs directly take an object.
Ex- The poet describes the beauty of nature.