What's some lesser known travel advice you have that doesn't come up often in these subs or online? I'll add in my own 2 pennies, if you know any others feel free to add on in the comments.

. pack Sim card keys - especially useful when travelling abroad and you need data - even if you have a Sim card key I recommend putting in your new sim in front of the person that sold it to you, I've had an instance that my new sim card didn't work despite the clerk insisting that i had a locked phone. Albeit my phone was not locked and after half an hour of trying they tried a different sim card that worked on the spot.

**Edit to add e-sims have come up a lot in the comments which is something I had no prior knowledge about but seem like a good alternative to normal sim cards

.Don't be afraid to ignore people/ tell someone to go away - in some places you might stand out as a tourist, you'll probably notice an usually high amount of locals approaching you; most of the time it's better to ignore anyone that approaches you, they're either trying to sell you something or rob you - I may be being pessimistic but better safe than sorry. My general rule is that if someone says something to me on the street I ignore them unless something is on fire and people are running away screaming.

.Plastic zip lock bags - they come in useful in many instances, I've had my shampoo bottle explode one too many times; they're like mini portable containers.

.elastic bands, safety pins and a sewing kit has always come in useful so i recommend those.

. Bank cards - usually a topic that's brought up a lot but I like Starling and Monzo, both without international fees, for Americans Charles Schwab seems your best bet. . Be wary of atm fees - research the best atms/ banks to use in the countries you're going to however atm fees are sometimes unavoidable. Always pick the foreign currency when it comes to withdrawal/payment