What is the correct spelling: practise or practice?
It depends on which version of English you’re using: in British English usage, the noun is practice and the verb is practise. In American English usage, both the noun and the verb are spelled (or spelt, in British English) as practice.
An expression with practice: practise what you preach – it means to do the things that you advise others to do.
Joe has a very successful legal practice in New York.