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jaishrijaishri 

I need help to send email to user one day prior to particular milestone date which is the best approach to use process builder, flow and workflow

Sai PraveenSai Praveen (Salesforce Developers) 
Hi,

As workflow and process builder will get retired soon it would be better to go with Flow.

Let me know if you face any issues.

If this solution helps, Please mark it as best answer.
Thanks,