This is a good set of advices for beginners. I especially like the ones about best practices, trying different things and why it makes sense to be conservative tech wise.

Nice state of the art view on how dynamic dispatch is implemented in several languages. Does a good way showing the trade-offs involved.

Good approach for tackling it indeed. The crux of the issue is really measuring the tech debt since it's still a fuzzy concept and we have no good metrics for it.