Learn English – Word for “a deep study”

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In the past few years I've started to do personal studies on different topics ranging all parts of life. They range in length from a week to a few months, on and off, but focus on understanding a particular subject more fully than I did at the start by reading, thinking, and writing about it.

I'm looking for a term (noun) to describe this or a verb to describe the act of doing the deep study on a particular topic. Are there any English words to properly describe this?

Best Answer

What first came to mind was:

delve: to carry on intensive and thorough research for data, information, or the like; investigate: to delve into the issue of prison reform.

Usually used with into, as in the example above.

Source: dictionary.com