A satoshi is the smallest unit of Bitcoin, and 1 BTC is equal to 100 million satoshis.
GoSats is a Cashback and Rewards application that enables stacking sats every time you shop. This way you aren't stuck with restrictive terms and conditions for redeeming your cashbacks also with no expiry dates or minimum purchase requirements.
BOLT 12 is a proposed upgrade to the Lightning network. For users, it can enable things like reusable payment requests, increased receiver privacy, and increased censorship resistance.