I am starting Uni and would like to invest a sum of money (~50k). I am considering buying ETFs and roboinvestors. I want a very passive strategy and I am thinking of putting everything in roboinvestors. Any advice?

Background:

• 21 y/o
• no debt
• no need for student loans; have a yearly allowance from scholarship
• have insurance
• not planning to buy car in the future
• planning to grow this sum for my house
• have CDP and FSMone (no investments yet)
• already have ~4k in Stashaway
• have ~7k in CPF

Basically, what is the most passive strategy (need not monitor regularly) to generate stable income that can leverage on my money early (~50k). Also, should I be concerned with my CPF at this stage?