1"From now on" or "hereafter" — refers to the period following the present. Used as a noun or adverb, typically in slightly formal contexts to state future plans, policies, or resolutions.
今後はもっと注意します。
I will be more careful from now on.
会社は今後の方針を発表した。
The company announced its policy going forward.
今後ともよろしくお願いします。
I hope we can continue to work well together going forward.
今後の天気の変化に注意してください。
Please pay attention to changes in the weather from now on.