Meanings

forget; be forgetful ofTo not remember or fail to remember something that one knew once.
forgetTo momentarily fail to recall something that one should remember.
forget; dismiss something from one's mind; think no more ofTo put one's difficulties, pain, or bad things of the past out of one's mind, or not care about them.
forgetTo not keep one's duty or one's debt to someone in one's mind.
forgetTo skip meals, sleep, etc., while being so absorbed in something.

Examples from Lessons (3)

네, 맛있게 드시고 물건 을 잊어버리지 마세요.
All right, enjoy your order and please don't forget your belongings.
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어려운 한자 도 한 번 보면 잊어버리지 않아요.
You will not forget even difficult Chinese characters once you have seen them.
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자주 쓰는 단어 는 안 잊어버리게 자주 읽어야 해요.
Frequently used words must be read often so you do not forget them.
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