Simple past   or   Present perfect

   The simple past  is used  to talk about actions in the past that have finished, without connection to the present.

Used with this time words :

when - then - ago - yesterday - last - in .....

The present perfect simple is used to look back on actions in the past  with a connection to the present.

Used with this time words :

ever - never - before  - since - how long - for - just - this - yet - already