I just started practicing calligraphy. Every time I practice writing, after a while, the ink will dry, the pen will be hard and my hair will be messy. How should this be solved?

If you don't write for a long time, you should clean the brush and be very careful when washing to prevent your hair from falling off. Wash your hair, straighten it and cover it. If you need to use it again after a day and a half, you don't need to wash it. Put the brush in a bottle with a small amount of water (just in case), and try to make it rain-proof, light-proof and moisture-proof.