I'm almost 28yrs old but I didn't save any money at all. How can I manage my salary if I intend to save the money? What skills or jobs can I learn and work to earn extra income at the fastest way?

Pay yourself first.

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Have a specific saving goal. Example, last year I aimed to save $15300 in my Supplementary Retirement Scheme. You can infer that I went all out to fulfill this goal

Do some budgetting, and make sure you stick to it all the way.

First, you should start tracking your expenses. Once you know how your expenses are, work out a budget. In this budget, please assign paying yourself (to another bank account) at least 10% of your income as your savings. You will first need to accumulate your emergency funds of 3 to 6 months of expenses. Perhaps at this point you should focus on accumulating your savings rather than going into investing. But if you do have $100 to spare, you can consider POSB Invest Saver.

As for side income, it could be challenging to find one if you have restrictions. Perhaps you can start off by selling things you don't need in Carousell. You will be surprised by how much money you can 'earn' out of it.

I would start off by tracking my expenses to know where my money is going. Once you have a clearer idea on how much you are spending each month and what are you spending on, then you can have a more objective POV of where to cut down to save your money from there.