Explanation
Process builder can be used to create a record-triggered flow that executes when an opportunity is closed as won and creates a follow-up task for the owner. Field update can be used to update a date field on the opportunity that can be referenced by a time-dependent workflow rule to create another task after 60 days.
References: https://help.salesforce.com/s/articleView?id=sf.process_which_tool.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.workflow_time_action_considerations.htm&type=5