Always without exception have backups of everything. Never keep all your documents in one place. Carry a spare phone, ideally with a local SIM or an independent virtual provider. Don’t keep cash and cards together, and don’t rely on just one bank account. It’s best to already have a local account and local apps on your phone like messaging, payments, and maps. I know that duplicating everything like this is expensive, but if you’re moving far away and into a different culture, language, and legal system… and you don’t know anyone there or have a network of contacts, you’re completely on your own.

And always have a backup plan. What if your bag ends up on a different flight? What if your phone breaks? What if there’s a protest at your destination and the protesters damage the infrastructure, causing an power and internet outage at the hotel? Then the electronic reservation system won’t work, and you won’t be able to authenticate using phone as hotspot to share to the hotel staff because the hotel system only authorizes devices on a specific network… oddly specific, I know, but this is straight from real life :) My backup plan is simple  - Printed confirmations, plus PDFs saved offline on my phone, an external drive, and my laptop.

And one more thing, you’ll never be able to anticipate everything. It’s a bit contradictory to what I wrote above, but you just have to accept that.