This is my first time flying. Could you please help me understand what the refund fee on this screenshot and the same-cabin rescheduling fee below mean?

The refund fee means: if you apply for a refund before 8:05 am on May 23, the refund fee charged is 558 yuan. At this time of 8:05 am on May 23 If you apply for a refund in the future, you will have to pay a refund fee of 620 yuan.

The meaning of the rescheduling fee for the same cabin is: before 8:05 am on May 23, if you apply to change the departure date of your flight, you need to pay 248 yuan if there is the same discount. Rescheduling fee: If you apply to change the departure date of your flight after 8:05 a.m. on May 23, you will need to pay a rescheduling fee of 310 yuan if the same discount is available. On the day you need to change, if the price of the flight is more expensive than the price you bought at that time, then this is not a change to the same cabin, but an upgrade.