Here are a few sites I have found useful
https://boards.cruisecritic.com/
Perhaps the best resource for cruising
https://www.rome2rio.com/
Helps getting from A to B
https://www.seat61.com/
Helpful for train travel, especially in the UK and Europe
https://www.ricksteves.com/travel-forum
Lots of good information
https://andyandjudi.com/
Lots of great info here
https://www.geobluetravelinsurance.com/index.cfm
This works for us, your needs may be different
https://medjetassist.com/
Just in case, never really want to call these people