write a good hand meaning in Chinese

写一手好字

He writes a good hand of chinese characters .
他能写一手好字。
He writes a good hand .
他写得一手好字。
Under him i learned to write a good hand pretty soon, but failed entirely in arithmetic .
在他手下，我很快练就一手好字；但算术糟糕透顶，毫无长进。
Under him i learned to write a good hand pretty soon , but failed entirely in arithmetic
在他指导之下，我很快地把字写得很好，但是算术却毫无进步，我失败了。