I know pokey sends push notifications to your android from nostr but what do citrine and amber do? Please #explainlikeimfive I’m not someone versed in coding or computer science 

 Citrine is a 'relay in your phone' app and Amber is a private key management / signing app. 

 What does it do for me to run a relay on my phone? 

 You can view this as a local backup of your data.