Do you keep a budget?

Do you keep a budget? I haven't done this before, now I will. Food, gas, electricity, heating oil, wood, household appliances, insurance and much more have become more expensive. One has to keep an overview. What is necessary, what can I do without. Where can I save? I haven't bought any clothes since the pandemic started. I also have far less opportunity to go to events and dress up. Although I feel sorry for the fashion houses, quite a few will probably have to close, but not just because of me. Going to a restaurant is also a thing of the past. I can cook well myself, smile. Heating is only switched on for 2 hours in the evening and in the morning. However, I make sure that the temperature does not fall below 17°C, otherwise there is a risk of mold. How are you dealing with the current situation?