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What is the best use of “spare” money?
You may also want to consider short term, low risk investments. Rolling Certificate of Deposits can be good for this. They don't grow like an Index Fund but there's 0 risk and they will grow faster than your bank. For my bank as an example today's rates on my Money Market is 0.10% APY while the lowest CD (90 days) is 0.20% APY with a 5 year going up to 0.90% APY. It's not substantial by any stretch but its secure and the money would just be sitting in my bank otherwise. For more information look at: What is CD laddering and what are its pros and cons?