Please suggest me some good source to learn more about ETL.

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“ETL” is a very vague topic. Do you have any specific language in mind that you want to focus in (Python, SQL, R)? Platform wise there is classic Jupiter notebook, databricks or you can look up cloud specific tools. After those areas are defined you can look into YouTube, udemy they will probably be a good starting point.

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I am more into sql.

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Do you want to learn about ETL or want to get into specific tools and technology?
ETL or rather ELT nowadays, is more of a concept which can be achieved through so many ways.
First I would suggest to learn about different types of data , storage options suitable for each type which will lead you to different type of databases.
Then you dig in to find what are the ways to move data around.
There are so many options in the market, do you have some opportunity in mind?

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