How to write strokes that look like swords? Is there any way to train them? (Calligraphy)

The strokes should be straight and angular.

I don’t know whether it is a hard pen or a soft pen, but you can check it out: Slim Gold Body, it should meet your requirements.

Just practice. If you like the post and like it, practice on it. There is no shortcut to making your work recognized by both experts and laymen.