I had a great visit there in 2013. Nearly everyone speaks English, but don’t just assume, ask (in Dutch) if they speak English. Very walkable, with pretty great transit. Lots to see just walking around. Just be a normal person and you’ll be treated fine.
Don't get really drunk or stoned and end up being obnoxious.
Try to be aware of traffic (especially bikes) and of blocking sidewalks/alleys etc. Look both ways on every lane of traffic you cross (including both bike lanes).
Try to branch out your trip from the exact center of the city (or by the train station) and don't rent an Airbnb inside the city center (they drive up local rents).
If you're standing on red bricks or red tarmac, you're probably blocking the bike lane.
If you can't see the bike lane, it's likely that you're standing in it (they aren't always marked).
Oh simply be polite and most of all have a sense of your surroundings/situational awareness, i.e., don't get in the way. You probably want to spend as little time in the main "downtown" area (roughly central station to the Rokin) as possible.
Although everyone under 80 years old speak near-native English (I exaggerate), you'll endear yourself by learning to say good morning, good evening, thanks, and please in Dutch and to start conversations by asking "Is English ok?" in Dutch.
Basically just don't be a jerk and the native Amsterdamers will happily take your holiday money.
True, but also if you go to Amsterdam as a tourist, you'll end up in the tourist trap places. Shady coffee shops, tours of the red light district, and over priced bars where you have to pay for toilet usage. And you can be rushed through the Anne Frank house for a price.
It's still possible, in my opinion, to visit as a "tourist" (I live in Haarlem now, so technically I'm a tourist when I go) and avoid all the trashy stuff. You can seek out the cool little neighborhoods like the Jordaan or de Pijp.
The public transport system will make you feel like you're in the 2030s. Super simple. Have your smart phone or smart watch connected to a credit card, or just have a chipped credit card, and you boop your way in any transport, you boop your way out and it charges you for whatever distance you traveled.
The hotels are incredibly expensive there and we didn't take one in the old city, but somewhere at a reasonable distance from a subway station a little further from the city center.
Do not neglect the possibility to bike in the city. We were walking everywhere, or taking trams or the subway, and I wish we biked more.
Boat tours are cool, you learn a lot. Lots of museums to visit. And if you can afford it, try these restaurants for an extraordinary experience : Wilde Zwijnen (The Wild Pig) and Moeders (Mothers).
You can visit Windmills with a 40 minutes bus ride. Pretty nice things to see and to taste (cheese!!!).