Gold coins is a virtual Savvity network currency. You can use them to buy gifts in the Gold coin shop.
You earn gold coins by being quick at replying to new posts in the Savvity community forums. If you are lucky you may also find gold coins to the right among the ads. If you do, click or tap to collect them.
To find out how many gold coins you have, tap or click on your avatar top right and look in the menu to the left.