Study abroad can be expensive. And if you travel a lot, it can be really expensive. Here's a simple plan for preparing for life abroad.
Price-wise local public transportation is always the better option over taxis. If in Europe, remember to validate all train and bus tickets! You don't want to get fined by a ticket collector!
Look into transit passes. The city you are in might have these available so you can save on transportation. Also investigate if you can get a discount for being a student.
In most cases buying groceries is far cheaper than eating in restaurants. Try searching out cheaper vendors in your neighborhood.
Food and souvenirs are less expensive and often better the farther away you are from tourist traps.