> Well that's the point of the exercises I suggest - to learn recursion :-/

Then we must have been talking past each other. We are considering this problem here:

>> I never took affinity to computer science/math, but I love building real world products with software. [...] I am struggling with all the interviews that have these leetcode problems.

Then your advice to these interview problem is to learn some CS - the useful parts of it? E.g. recursion is CS.