That means you did not read the necessary writing. Because if you did you would not be asking this question.

If you having zero prior experience in stock markets and other speculative asset trading, you should refrain from bitcoin trading at the start. Learn how it works and how to secure your wallets before starting trading.

The "Marketplace" in this forum is usually for goods and services. Currency exchanging also happens but not trading per se.

What I said above, dont jump into trading because there will be losses and profits. In the starting usually losses are more than profits. Try dummy trading on paper first for at least six months before putting in real capital.