How can I know for sure in what situation I should use sharp vertical line and in what situation I should use rounded vertical line?
For example, from videos on youtube I do know for sure that vertical line in 申 is sharp and I do know for sure, that vertical line in 木 is rounded.
Is there some rule or hint or tip on defining myself when it is sharp and when it is rounded (tomed)?
My question is about vertical lines only.