The definite article (the) is not used in English quite as often as it is in Swedish. In addition, there is only partial overlap between the ways it is used in the two languages. Therefore, be very skeptical about your own inclination to add “the” to sentences.
Here are some typical cases in which “the” is not used:
Generic nouns in English usually do not take the definite article:
The peace is preferable to the war.
Peace is preferable to war.