rents

I seem to recall coming across a post or comment on HN or somewhere else (really sorry, I am not able remember correctly) about how inheritance can only ever be used in three scenarios.

I think it referenced an article or post from some professor.

One such was Inheritance for re-use. Other two I do not remember.

I have been searching on and off for quite some time but have not been able to locate it.

Can anyone help?

Experience level 2-4 years, language agnostic.

GoF's desgin patterns (and Head First design patterns) are the only ones I know of.

Goal would be to improve myself as a software developer (preparing for interview design questions would be an added bonus).

Some topics that come to my mind would be:

1. Applying design patterns to real world problems. Ex. how would a you design an elevator system?

2. Architecture of some complex applications such as facebook, twitter, whatsapp etc.

3. Other common designs usually used in software engineering. For example : reliable messaging etc.

These problem and their solutions really interest me but again I don't have an exhaustive list of these topics. For example, I came across reliable messaging concept, and then I looked for it. But there may be several other topics which I haven't even heard of.