1. Contribute whatever you need to contribute to your local pension.
2. Save the rest of your money.
3. Deploy your money when needed by either investing it in yourself(health, skills, whatever else) or into an area where you have an edge(so computers). At worst, if you have some idea for a startup later in your life you can use this as startup capital.
My general advice in this regard: Passive "income" for people under 25 is a pure financial trap. You need to be making active "income" and saving otherwise. All your money you earn right now should ideally be spent on developing and honing whatever edge you have in the area that interests you. And it obviously isn't the financial markets.