I am getting these errors for almost every script

mysql$>$ SELECT sku AS PRODUCT$\_$SKU, description AS PRODUCT$\_$DESCRIPTION,

$->$ COUNT$(*)$ AS RETURN$\_$FREQUENCY

$->$ FROM Orders INNER JOIN RMA ON Orders.OrderID $=$ RMA.OrderID

$->$ GROUP BY PRODUCT$\_$SKU

$->$ ORDER BY RETURN$\_$FREQUENCY DESC;

ERROR $1055(42000)$: Expression #$2$ of SELECT list is not in GROUP BY clause and contains nonaggregated column 'QuantigrationUpdates.Orders.Description' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql$\_$mode$=$only$\_$full$\_$group$\_$by

mysql$>$ SELECT COUNT$(*)$ AS RETURNED$\_$AMOUNT,

$->$ Orders.SKU AS PRODUCT$\_$SKU,

$->$ Orders.Description AS PRODUCT$\_$DESCRIPTION

$->$ FROM Orders INNER JOIN RMA ON Orders.OrderID $=$ RMA.OrderID

$->$ GROUP BY PRODUCT$\_$SKU

$->$ ORDER BY RETURNED$\_$AMOUNT DESC

$->$ LIMIT $10$;

ERROR $1055(42000)$: Expression #$3$ of SELECT list is not in GROUP BY clause and contains nonaggregated column 'QuantigrationUpdates.Orders.Description' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql$\_$mode$=$only$\_$full$\_$group$\_$by

I am working on DAD $220$ Project $2$