Can I write my own calligraphy, or can I write my own calligraphy for others? Can I stamp my signature?

The next paragraph of a calligraphy work is the symbol of the author. It is customary to write your name and stamp. There are also some authors who don't seal it, but they have never seen one.

There is another situation, that is, inscription on the back of other people's paintings and calligraphy works, and then signature. You can give it away.

Also, it is ok to stamp only the collection seal on other people's paintings and calligraphy works.