Where can I find protocols?

Excuse me, I'm a bit of a novice in the world of cryptocurrency and finance, and I'm wondering where I can find protocols that are relevant to this field. Could you please point me in the right direction? Are there any specific websites, forums, or publications that you would recommend? Additionally, could you briefly explain what protocols are and how they relate to cryptocurrency and finance? I'm eager to learn more and gain a deeper understanding of this fascinating industry.