When I started keeping fish.....50+ years ago. There were 3 sources of information.
Your LFS
Magazines
Your Local fish club.
And there were very few prohibited imports......Wholesalers brought in anything and everything
Even fish clubs imported fish.
Over the years things have changed a lot.
LFS are fading away....overrun by Pet warehouses with well meaning staff that generally don't have a clue
and for hobbyists On-line sales of Fish and Goods is the future
Magazines can't be found at the local Newsagent
The Local fish clubs are mostly geriatrics (like me)
List of Allowable importable fish is getting smaller and smaller.....with lots of Mutants/Hybrids....
Locally bred fish are mostly rubbish (not all thankfully)....few selectively breed
For 8 of last 10 years Forums were the social hub......but many haven't been well managed or become very clicky
Facebook seems to be where it's at.....pick a Group or groups that suit and connect via your phone
Personally....50 years ago was a lot, lot better, BUT you can't fight progress!