There are many dud or suspect sites on the internet, often allowing deposits but not withdraw (I lost some $$$ to a mob in Russia when I sought to withdraw).
Coinspot is an Australian-based trading house registered with ASIC and subject to Australian laws. Transactions are in AUD or USD with a flat 1% commission on each transaction. Just about all cryptos are available, with some excellent features such as market capitalisation, 24 hour trading volumes, 24H value % changes, good spreads. Quite seamless in both deposits and withdrawing. I use it and like it. You can register without paying anything.
Good luck & cheers
