Need Guide for first time at singapore

Hi all..

So, in few days i will in Singapore for 6 days.. yeyy...

But this is first time i go outside my county. So as first-time solo travelling, I want to ask few things.

1. Where is the best place to buy gaming laptop?? I Want to buy gaming laptop like MSI or Legion. Not custom one, but more like built in and ready to use.

2. I plan go to Universal studio (alone), any tips?

3. What should and shouldn't do in Singapore?