Small changes to put aside some money you will need.
Cut out the coffees outside every morning
If you love coffee, if you love the smell of freshly ground beans, the first warm sip on a cold winter day, then you know what we are talking about. But if you take a coffee every day, then it is equivalent to 3 euros more or less a day. If you only get the working days, it is 15 euros per week, and 60 per month! A pair of shoes, so to speak.
Limit food on the outside and keep it only for special occasions
If every time you get tired you just grab a sandwich or a portion of food outside, this can easily get you off budget. Of course, cold sandwiches are not negligible if added during the month. Surely this will save you at worst 30-40 euros per month.
Do not forget the supermarket list
Say it has not happened to you. You've come in to get some shampoo at the supermarket. You walk down the aisles, fill the cart and then realize that you have not yet bought your primary goal! As much as the market insists that you need new notebooks or decorative candles, if you really keep a list of things you want and do not get what you do not really need, you end up saving money. This approach proves useful in any store.
The small expenses that make a huge difference.