This is the 644th most frequent Japanese word.
楽しん
The Japanese word "楽しん" (tanoshin) is the stem form of "楽しむ" (tanoshimu), meaning "to enjoy" or "to have fun."
楽しんでいます is the progressive form of 楽しむ, implying ongoing enjoyment of an event or experience.
彼はコンサートを楽しんでいます。
He is enjoying the concert.
楽しんだ is the past tense of 楽しむ, referring to completed enjoyment of an activity.
週末は友達と映画を楽しんだ。
I enjoyed watching a movie with friends over the weekend.
楽しんでください is a polite imperative form of 楽しむ, used to invite someone to enjoy something.