Where should i learn divide and conquer technique from??

I was studying divide and conquer conquer technique and i find that when one says :-

  1. Divide the problem into two parts.
  2. solve the problem recursively.
  3. and finally combine them to get to the answer.

I get confused in taking parameters at return side when solving recursively. and then how to do calculations with these parameters and the return which parameter to which statement.

So any suggestion please for leaning divide and conquer technique.

try this divide and conquer link and this link
and videos

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