How can I migrate files from intel MacBook Pro on High Sierra to M2 Mac Mini?

Easiest way would be to put them on iCloud, see Keep your files up to date and share them with iCloud Drive - Apple Support. See also iCloud+ plans and pricing - Apple Support. Plans are month-to-month so cancellable post-migration.

If you have already set up your new Mac Mini, and you just need to transfer data files then the "easiest/simplest" way would be to copy them from the old MBP to a good USB flash drive or an external drive; then connect the drive to your new Mac Mini and copy them from the drive to the Mini.