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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.
A recent guideline from 文化庁 clearly says this distinction is not important in most cases. See page 53 of this PDF (常用漢字表の字体・字形に関する指針（報告）（案）） (2016):
As for 木, you can also use はね (
).
Some recent elementary school teachers are extremely strict on this kind of thing, which has caused much controversy. Outside school, very few adults care about this. If you want examples for practice, find some 教科書体 font.
(The guideline above is for the general public. Professional calligraphers and historians may have their own opinions.)
