What am I paying for?

Hello,
I know many tech in the house are aware of google Platform. I have never used it but AWS.
Recently I embraced Google Platform, launch an instance and then sql.
From all indications am yet unable to understand what is actually increasing my billing on the sql
Google wouldnt not answer any mail sent to them for weeks
Here is a screenshot…can some one advise or identify what is actually costing me much?