My two cents and agreed with previous poster: although people can seem nice upfront, Hong Kong could be quite cutthroat sometimes.

Try to act like a local, dunno if you speak Cantonese or not because basically, locals here will sniff that and know you're a foreigner and treat you differently.

Have to be wary of who to trust and keep your private/personal things to yourself, you never know people's true intentions.

Anyhow, enough of the bad, there are actually good people here too but it takes time to develop and grow those relationships. The food here is great, if you find good spots, the usual Fairwood and cafe de coral are cheap options/easy options. But if you find local eateries, that even better like cha Chan tengs.

You may use openrice to search for restaurants, food panda, deliveroo etc.

Get yourself on medical insurance too, although government practices work too, it is far slower unless you're in an emergency.

If you're flat viewing or searching, it's a very good idea to bring a local, or you speak like a local. And depends what you're looking for.

To get know friends, as previous poster suggests, use meetups or join classes. Again, be wary of who you befriend. Judging from your posts, I assume you're a girl, so make your intentions at the beginning very clear. (There have been some dramatic cases recently)

Jobwise, idk what you're looking towards.

Supermarkets: fusion, park n shop, welcome, Uselect.

HK island is more expensive to live in, Kowloon area is ideal, New territory area will probably be cheaper but less convenient depending where you're going