GCP BigQuery - how to update Big Query table with a .csv file (for beginners)

GCP BigQuery - how to update a BigQuery table with a .csv file using cloud shell.
Steps are included as well as the code.
Hope this is helpful for GCP data engineers and data analysts out there.

[@kaushabvithani8504]

Hi what if I want to update data to some 8th coloum rows , where other coloums data already it's present then how to update via .CSV?