You can use the adverb hereafter to talk about what happens next, after this moment. For example, you might say, "I will hereafter get my homework done in time."

When you mean "from now on," you can say hereafter, like when you give a friend a new nickname: "You will hereafter be known as Brostache." Another kind of hereafter is what happens after death. When someone talks specifically about "the hereafter," he usually means heaven or life after death. This is the earliest meaning of the word, and it's often mentioned in religious contexts and at funerals.

Definitions of hereafter
  1. adverb
    following this in time or order or place; after this
    hereafter you will no longer receive an allowance”
  2. adverb
    in a future life or state
    “hope to win salvation hereafter
  3. adverb
    in a subsequent part of this document or statement or matter etc.
    synonyms: hereinafter, hereunder
  4. noun
    the time yet to come
    synonyms: future, futurity, time to come
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    past, past times, yesteryear
    the time that has elapsed
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    kingdom come
    the end of time
    an indefinite time in the future
    the near or foreseeable future
    the near future
    an indefinite time in the future
    type of:
    the continuum of experience in which events pass from the future through the present to the past
  5. noun
    life after death
    synonyms: afterlife
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    kingdom come
    the next world
    perpetual life after death
    type of:
    life, life-time, lifespan, lifetime
    the period during which something is functional (as between birth and death)
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