"learned in depth" is correct and can be used in written English.
You can use it when you want to emphasize the idea of gaining a detailed, thorough understanding of a subject. For example: In school I learned the basics of history, but last summer I went to an intensive course where I learned the subject in depth.
You'll learn in-depth metrics about your customers and their behaviors, your employees and how they work, and even the gritty details about how your business operates.
Only 27.4% of 5th and 6th year students had already completed a course in tropical medicine, which means that about three quarters of all graduating students have never learnt in-depth about tropical diseases.
The goal of purposeful sampling is to select participants who provide "information-rich" cases, that is, participants who provide data that will allow us to learn in-depth about the phenomenon of interest [ 10].
Merton told me he could be perfectly faithful to Christianity, yet learn in depth from other religions like Buddhism.
Alongside biologists at La Escobilla turtle camp, visitors learn in depth about sea turtles and participate in efforts to sustain them.
Closely tracking an influential 2006 report by the National Council of Teachers of Mathematics, the panel recommended that math curriculum should include fewer topics, spending enough time to make sure each is learned in enough depth that it need not be revisited in later grades.
However, concerns about generalisability are not central to narrative research, in which the focus is on what can be learned from in-depth study of the particular narrative that can extend and challenge conventional understandings.
The course is a great way to learn an in-depth study of the Holocaust and the various targeted groups affected by the Nazis.
We fixed it that he would come to India to learn in more depth.
Rather than taking a 90-minute tour, the children enrolled in the after-school program spend nine weeks learning in greater depth about life during the Federal period.
