This will produce a timestamp and a username email in Columns 1 and 2 of any sheet in google Sheets

update log

function onEdit(e) {
    var row = e.range.getRow()
    var sh = e.source.getActiveSheet();
    var col = e.range.getColumn()
    var header = sh.getRange(1, col).getValue(); // I know this is  var is not right...
   
    if (row > 1 && col > 2){ 
    e.source.getActiveSheet()
        .getRange(row,1)
        .setValue(new Date());} 
        
    if (row > 1 && col > 2){e.source.getActiveSheet()
       
        .getRange(row, 2)
        .setValue(e.user.getEmail() )}
   ;
}