In which currency is my profit calculated?
The different instruments are traded in different currencies. For example, commodities (like Gold, Oil, Silver) are traded in USD, stocks and indices are traded either in EUR or USD depending on the origin of the instrument. The profit or loss of the currency pairs (like EUR/USD) is calculated in the second currency of the pair. If your account is in different currency, then your profit or loss will be exchanged in real time in the currency of your account.
Can you manage my account or tell me what to buy or sell?
Trading 212 does not offer advice or Managed Accounts. You are the only person who can decide what to buy or sell.
Do I have to pay taxes on my profit?
Your profits could be liable for tax in your country according to your local regulations. Incomes from financial trading usually must be declared in your personal tax return. Please check with your local tax office.