Try to find all of the local apps. For example, Uber & Lyft were common in the US, but here Bolt is a fraction of the cost and the drivers are professional and dependable. There are all sorts of apps to help you get around using public transportation also that make it a lot easier. Check into that hotel app that will only contact you via SMS (It's similar to Priceline, but because it's done via SMS they can tell you the name of the hotel which means that you can check out reviews in advance. I believe it's called SnapTravel and is offered with several different apps. That being said, they are not always the cheapest, just usually the cheapest.)

Depending on where you're traveling to, negotiating on price might be appropriate and expected. It seems to depend on the country though, so please keep that in mind. I've gotten some great discounts and upgrades simply by asking politely though. Not really a budget tip, but always ask the front desk to put you on a floor with good wi-fi. They seem to know where the complaints come from and can easily book you into a room with more consistent wi-fi.