Sorted:

Spark Broadcast Variables: Key Functions

Spark Actions vs Transformations

Spark Streaming for Real-Time Data Processing

Spark Shared Variables: Broadcast & Accumulators

Spark DataFrame vs Dataset: Key Differences

Spark Task Retry Mechanism Explained

Spark Data Partitioning Explained

Spark Data Skew Optimization: Fixes & Tips

Spark Executor Memory Management

Spark Generalized MapReduce Explained