Start with the pages nobody markets: terms of use, risk disclosure and the withdrawal policy. A platform comfortable with scrutiny publishes them in full rather than reducing them to three friendly bullet points.
Then look at how returns are described. Language matters: "past performance does not guarantee future results" is a standard disclosure, while a specific monthly percentage presented as an expectation is not.
Finally, test the support channel before you deposit, not after. Ask a concrete question about withdrawal timing and see how precisely it's answered — that reply is a fair sample of what you'll get when it matters.
Reading a statement line by line
A statement is a list of movements, not a verdict. Deposits, withdrawals, positions opened and closed, and any fees each appear on their own line, and the balance at the bottom is simply the sum of everything above it.
The lines that matter most
The opening and closing balance for the period, and any line you can't immediately explain. One unexplained line is worth an email; a pattern of them is worth a 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 relying on the account staying open indefinitely. 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 invest. The value of investments can go down as well as up, and you may get back less than you put in. Do not invest money you cannot afford to lose.