Dear Data Engineers, a gentle reminder to: - Learn SQL before NoSQL. - Learn Python before PySpark. - Learn Linux Basics before Hadoop. - Learn HDFS before S3/ADLS/GCS. - Learn Batch Processing before Streaming. - Learn Data Warehousing before Data Lakes. - Learn ETL before ELT. - Learn Kafka before Flink. - Learn Hive before Spark SQL. - Learn Airflow before Cloud Composer. - Learn Shell Scripting before Cloud Automation. - Learn Star & Snowflake Schema before Data Vault. - Learn On-Prem Data Engineering before Cloud Data Engineering. It all starts with the basics & fundamentals. Have the patience to master them and then move to languages & fundamentals. Good core knowledge allows you to adapt & learn any technologies you need to do your job.