@YurySolovyov yes, exactly that. There are very few examples where inheritance makes sense (GUI is probably the one, but I believe that main reason for that is because no one ever truly tried other way). However interfaces can (and in most cases will) have hierarchy, ex. DoubleEndedIterator doesn't make sense on type that do not implement Iterator .

OOP has nothing to do with either of terms you have mentioned. OOP is about interfaces. Let me present great example of big system that uses OOP and has nothing to do with composition and inheritance: UNIX filesystem We have different kind of files in UNIX: named pipes UNIX sockets regular files block files special files symbolic links And most of UNIX tools (like cat , head , tail , etc.) will work with either of them without any problem. That is what OOP what it is, sharing common interface between different implementations.

Who needs FTP nowadays? Serious question. In 99% when you need to use FTP there is problem with your platform.

Vi is editor created from programmers to programmers with 1 unique feature: it is language to edit text, not tool to write text, and that is HUGE difference. For more check http://stackoverflow.com/questions/1218390/what-is-your-most-productive-shortcut-with-vim#answer-1220118

I checked Vim but in fact I am using NeoVim. Why? configurability speed hell lot of plugins

Recently I became big fan of Hugo . It is fast and easy generator written in Go.