You are not restricted as to what you can trade in an IBKR Lite account but are limited to your approved trading permissions.
What can I trade in an IBKR Lite account with IBKR Singapore?
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How do I open an IBKR Lite account?
Can I use the API with an IBKR Lite account?
How do I open an IBKR Lite account with IBKR Singapore?
What can I trade in an IBKR Lite account?