https://www.openstreetmap.org/node/11055012020

shop=fair_trade ? What kind of products are sold there?

shop tag should contain shop type value - and fair_trade is not one

You can have fair trade shop of various types

shop=greengrocer
shop=cosmetics
shop=grocery
shop=convenience
etc

are all possible. What kind of shop is this one?

Fair trade status can be tagged with fair_trade=yes/fair_trade=only - see https://wiki.openstreetmap.org/wiki/Key:fair_trade