Ask questions about calligraphy practice

You should be talking about hanging needles and vertical strokes. You should hide a little front when hanging needles and erect pens, and then write them down naturally from coarse to fine. What you said about vertical strokes is not straight, which is normal for many beginners. That's the reason why the brush is useless and the stroke force can't be controlled. I suggest that you write short strokes first, and then practice from short strokes to long strokes, and each stroke is more than one.