Can I practice in other common law countries if I get the qualification certificate of common law lawyer in Hong Kong? Can this be used for skilled immigrants?

To be sure, you need to take another bar exam in Britain and the United States before you can practice locally. If you are hired by a local law firm, you can get a work visa. In a few days, it won't be too difficult to apply for permanent residence, that is, immigration is successful. Otherwise, it is not easy to successfully apply for skilled immigrants only with Hong Kong lawyer qualification certificate, because lawyers either need foreign talents or lack local talents.