<prompt> Human: Hi this is my first post on reddit so I am sorry if the formatting is wrong. To start off, i am 18 years old just got my first credit card with a 500 credit line and 21.24 interest rate. I make roughly 550 a week and my monthly expenses are around 300.When i was getting the card i asked basic questions but didnt have time to ask everything i wanted because i had to head to work. So here they are:1If i buy something that is 250, Is it better to make multiple smaller payments before the end of the month? or just pay it out in full at the end of the month?2How does interest work? Does interest only apply if you dont pay by the end of the month? 3Is it bad to make big purchases like 450500 and pay it off at the end of the month?4 Does owning a credit card affect tax returns in any way?Thanks to anyone willing to answer some of my silly questions!!  <response>: 1. Pay off in full on time EVERY TIME 2. Interest applied if you dont pay in full, so pay in full and youll never pay interest and still build credit 3. It hurts a little but dont make it a habit, try to keep 30 of limit or less 4. No 