Those crash boards are useless. If they were useful, there would be no bad calligraphy in the world. Treat the symptoms, not the root cause. If you want to write a good hand, you must practice more and practice correctly.
If you want to practice calligraphy well, you must first choose a pen and copybook suitable for beginners.
Taobao, I recommend one for you. You can find pens and copybooks suitable for beginners. There is also an introduction on how to practice correctly.
Search online? "Invention patent nib" can be found.