what are differences between‘ruin’‘spoil’‘damage’and‘destroy’？

Question

Answer

destroy something = ruin something =  wreck something
= to damage something so badly that it can no longer be used or so that it no longer exists
'The building was completely destroyed by fire.'

spoil something: to be careless or make a mistake, with the result that something is no longer good: 
'Don't put too much salt in the soup - you'll spoil it.'

Answer

Not best examples. You have ruined my plans. By adding too much salt i have spoiled my soup. The car was damaged seriously in the accident. Nuclear bomb destroed my country.