Data Lake/Lakehouse implementation and precautions for successful implementation. Our general understanding that Data Lake/Lake House is a storage place. The Data Lake/ Lake House not only a storage place but also the brain of an enterprise. It must be designed as per the business need with proper intelligence in place. A comparison of a Data lake / Lake House and Delta Lake and how a Lake House could be easily expanded to a Delta Lake summarized. A step-by-step analysis, design, development, and implementation plans with all the challenges and best practices described in detail. Also, this paper provides pointers on various topics such as data processing, storage layers, downstream process /planning, data quality, data governance, data retention-backup, & data visibility, security, automation, tools selection, physical/ logical architecture sample etc. are summarized.