depends where you wanna go but airfare is usually the most expensive so i usually try planning trips to european countries in the winter (jan-feb) when it’s freezing bc it’s cheaper lol. i only stay in hostels ($20-35/night) & do not check luggage. i only take public transport & don’t eat out excessively (this depends on the country too, i ate out more in italy than denmark for example) - hence me going to so many grocery stores