Start with the pages nobody markets: the terms of use, the risk disclosure and the withdrawal policy. A platform comfortable with scrutiny publishes these in full instead of summarising them into three friendly bullet points.
Then look closely at how earnings are described. Language matters: a statement like "past performance does not guarantee future results" is a normal disclosure, while a specific fixed monthly percentage presented as a promise is not.
Finally, test the support channel before depositing, not after. Ask a concrete question about withdrawal timing and see how quickly and precisely it gets answered — that is a fair sample of what you can expect later.
Reading your statement line by line
A statement is a list of movements, not a verdict. Deposits, withdrawals, opened and closed positions, and any fees each appear on their own line, with the balance at the bottom simply the total of everything above.
The lines that matter most
The opening and closing balance for the period, and any line you can't immediately explain. One unclear line is worth an email; a pattern of them is worth a phone call.
Fees in plain sight
Anything deducted should appear as its own labelled line. A fee that only shows up as a smaller balance is a reason to ask questions.
Keeping your own record
Download each statement as it's issued rather than assuming the account stays open forever. A folder with twelve files answers most questions faster than any support queue.
Investing involves risk, including the possible loss of some or all of the capital you put in. The value of investments can go down as well as up, and you may get back less than you originally invested. Never invest money you cannot afford to lose.