When unloading data to a stage, it is recommended to define an individual file format. This ensures that the data is unloaded in a consistent and expected format, which can be crucial for downstream processing and analysis2

Direct Shares allow secure data sharing between Snowflake accounts in the same region. No data is copied; Snowflake provides access to the original data using metadata and access control.
Reference:
Snowflake Docs: Data Sharing

Snowflake's hierarchical key model includes several levels of keys, where Account master keys and File keys are part of this hierarchy. Account master keys are used to encrypt all the data within an account, while File keys are used to encrypt individual files within the database2.

Snowflake credits are the unit of measure for the compute resources used in Snowflake. The number of credits consumed depends on the size of the virtual warehouse and the time it is running. Larger warehouses consume more credits per hour than smaller ones, and credits are billed for the time the warehouse is active, regardless of the actual usage within that time.
References: [COF-C02] SnowPro Core Certification Exam Study Guide