The videos below will show you where to get the Gold Bricks and other collectables in the various HUBs.
D'Qar Rebel Base 100% Gold Bricks + Collectibles (Part 1):
D'Qar Rebel Base 100% Gold Bricks + Collectibles (Part 2):
Jakku 100% Gold Bricks + Collectibles:
Takadana 100% Gold Bricks + Collectibles:
Millennium Falcon 100% Gold Bricks + Collectibles:
Starkiller Base 100% Gold Bricks + Collectibles:
Rathtar Hunting 100% Gold Bricks + Collectibles
Maz's Castle 100% Gold Bricks + Collectibles
The Finale 100% Gold Bricks + Collectibles