Start with the pages nobody markets: terms of use, risk disclosure and withdrawal policy. A platform comfortable with scrutiny publishes these in full rather than summarising them into three friendly bullet points.
Then look at how earnings are described. "Past performance does not guarantee future results" is a normal disclosure; a specific monthly percentage presented as an expectation is not.
Finally, test the support channel before depositing, not after. Ask a concrete question about withdrawal timing and see how clearly it is answered — that reply is a fair sample of what you will get later.
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 cannot 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 is issued rather than relying on the account staying 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 invest. Values can rise or fall, and you may get back less than you put in. Never invest money you cannot afford to lose.