The short answer
Do not start by asking which product to buy. First decide what the €20,000 may need to do, when you may need it and how much risk you could genuinely accept. The same money cannot be your emergency fund, house deposit and long-term investment at the same time.
A lump of cash can feel like one decision. It is usually several decisions sitting in the same account.
Give the money separate jobs
In Ireland, the tax treatment of deposits, shares, funds, ETFs and pensions differs. That means the investment structure matters as well as the underlying asset. A regulated adviser can make a personal product recommendation after assessing your circumstances.
Money, Just For Her can help you organise the questions and trade-offs. It does not recommend a fund, provider or product.