Rebates are for liquidity providers.
That means BTC sellers?
A "taker" is a buyer of BTC, while a "provider" is the seller of BTC... if I am wrong, please correct me.
No, a taker is someone who's order executes against an existing order on the order book. A provider is one who's order does not execute right away but instead goes on the visible order book. Providers can be buyers or sellers, and likewise for takers. It all depends on how your order executes.