[Procyona]

Here is a useful text of what the terms wushu and gongfu (kung fu) mean, at least read this way.

source http://www.usashaolintemple.org/chanbuddhism-kungfu/

Like stated in the article, wushu means martial arts skills, gongfu any skill.
According to this picture, the Chinese characters emphasis the idea of gong fu quite well I think - it is any form of skill that reaches toward the limitless sky   

[Haveunique]

Thank you, Milla! A few years ago I created the same topic in the Ukrainian/Russian part of the forum, about the meaning of kung fu It is indeed about the art and mastering a skill, and the ways to do it   

[Procyona]

You are welcome Do you or any of you forumusers know if there is an additional way to read those characters?