Could someone explain how the TX operation here works?
Multiple outputs are usual, just like e-mail.
If one of your friends has sent you 5 BTC, and another friend has sent you 2 BTC, you should combine and spend them if you need to buy something for less than 7 BTC and greater than 5 BTC.


(By the way, do you know what a change is?)


There is no "This output gets its value from this input" All input values are summed, then spent.