How to answer or dodge when people ask about my salary?

Is better to keep to yourself unless is your close friends.

If family members or relative asks me, I always say "enough to pay bill and survive la"

Be firm and polite to reject them. Salary is confidential and personal. You can say you are not comfortable in sharing and change to another topic.
Remember you are new to the dept and your colleagues cannot help you fight for higher pay. Only your boss can.

Even if you don't tell, they are probably googling how much you would earn behind your back (especially if you are in a large organization which has very transparent ranges for their roles - say... Consultant at McKinsey - you can easily find those on Glassdor).

That being said, nobody would ever know your true package + benefits unless it's your spouse (then again, not all spouses are fully transparent).

It's been some time since someone asked about my exact salary (early 30s now), when I switch jobs nowadays friends just ask "was there a significant increase?" and I would say "around 30%" or somewhere along those lines.

Perhaps, it's due to this Covid season where salaries have dropped across the board and your peers are just concerned that they are being underpaid for the same qualifications.

I'm not sure how privy a person you are, but if someone asks me when I was graduating or got an offer - I'll just say "3+k", should you not want to go into too much details... and let them wonder if it's 3.1k or 3.9k :D.

What's the worse that could happen? Actually, you might just become more knowledgeable about your peers' ranges.

For those who earn 2+: "Wa 3+ ah, I'm only 2+"

For those who earn 4+: "Oh........" keeps quiet and you can ask them "So, what about you" they can either say:

1) "Around 4+" - there you have it!

2) "Ya around there" - which implies they are also 3+/4

3) "Confidential" - which implies this is probably a peer you share much to in future (haha)