Calligraphy: What's the secret of inseparable brush?

If you want to keep the brush from splitting, you must first have a good brush. Secondly, when you start using a brush, you must stick ink directly. Third, you must use the pen correctly. Fourth, fasten it with a pen cap after washing with water. If you don't have a pen cap, wrap it in rice paper. Another supplement is that it is not necessarily a good pen. How can you write without a pen in that building?