What are differences between US supreme court and California supreme court?

The U.S. Supreme Court is the highest court in the federal judiciary, interpreting federal law and the Constitution, while the California Supreme Court is the highest court in the state judiciary, focusing on state law and the California Constitution. The U.S. Supreme Court has nine justices, appointed for life, whereas the California Supreme Court has seven justices, who are appointed and serve 12-year terms, subject to retention elections. Additionally, the U.S. Supreme Court hears cases that often involve federal issues, while the California Supreme Court addresses significant state legal questions and can review lower court decisions within California.