§77

Ethical and aesthetic concepts are so lacking in sharpness that it is an impossible task to draw sharp boundaries to them - you could, but you might just as well have drawn the boundaries elsewhere (does the same apply to the concept 'game'?)

Wittgenstein's example is 'good'. He suggests that if one wants to get clear about what 'good' means you'd do well to look at how you learnt it - in which language games.
I'm not sure what the 'moral' we're supposed to draw here is. Thinking about how I learnt the word 'good' - I probably would have heard my parents using it in contrast to 'bad' or 'naughty'. If they endorsed/liked/wanted to encourage behaviour in me then they would say 'good boy'. They might also have asked me questions about my toys - 'is that a good car? Do you like it?'. - It was used in praising and in Q&As.