Apache Spark Documentation
Unknown
Official free docs and tutorials
More resources on Big Data & Tools
Databricks Community
Free Spark resources and notebooks
Apache Kafka
Official site with guides
Apache Spark with Scala
Learn Apache Spark with Scala! Master big data processing with hands-on examples from expert Frank Kane.
hadoop.apache.org
Official Apache Hadoop project page for the open-source framework enabling distributed storage (HDFS) and processing (MapReduce/YARN) of big data. It offers documentation, downloads, getting-started guides, and ecosystem resources to help you deploy and use Hadoop.
Big Data
Coursera course: Big Data Analytics
spark.apache.org
Apache Spark's official site is the home of the open-source unified analytics engine for large-scale data processing. It offers downloads, detailed documentation, tutorials, API references for Spark (SQL, PySpark, R, Scala), and guidance to get started or contribute.