What notes app are you using? Ideally, it would have an export/import feature and you would use the same app on the new device.
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The easiest is to use a Notes app with a sync feature in the first place. If your app(s) do not support that, I guess you will need to copy/ paste it into a new Notes app which does support syncing. 'Joplin' and 'Standard Notes' are two very nice (and are even open source) Notes apps which do that perfectly IMHO.
Google keep syncs to you Google account and requires no manual exporting or transferring. You could also achieve something similar with OneNote. So maybe consider using a different note app?
you really gonna ask this and not list what apps you use to store your notes on?