Words are in my heart. I don't care what pen I use, but I can write with the help of pens including art pens when necessary. Therefore, the key to practicing calligraphy is intentional or unintentional. I remember an old man writing calligraphy with a brush in the countryside. Because there is no writing brush, he actually holds a cotton pad in his hand, but it is also horizontal and vertical, and his calligraphy is rigorous. So far, he lamented.
So, practice writing, don't be too entangled in external requirements, you will get words when you are inside.