Start with the pages nobody markets: terms of use, risk disclosure and the withdrawal policy. A platform comfortable with scrutiny publishes these in full rather than compressing them into three friendly bullet points.
Next, look closely 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 depositing, not after. Ask a concrete question about withdrawal timing and note how quickly and 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 as 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 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 relying on the account staying open indefinitely. A folder with twelve files answers most questions faster than any support queue, and it's the record you'll want if you ever need one.
Investment 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 receive back less than you originally put in. You should not invest money that you cannot afford to lose.