Learn Swedish: Jag kastar bort den. - I am throwing it away.

In Swedish, the particle (bort) must stay right next to the verb. Unlike in English, you cannot put an object pronoun like den (it) between the verb and the particle. It is always verb + particle + object.

Which word gets the stress when I say the phrase kastar bort?

In Swedish particle verbs, the heavy stress always falls on the particle, not the verb. You should put the emphasis on bort, so it flows like 'kastar BORT'.

Does bort always mean 'away'?

Often, yes! It implies movement away from a place or being gone. When paired with action verbs like kastar (throw) or springer (run), it creates particle verbs meaning 'throw away' or 'run away'.

Why use den for 'it' instead of det here?

You use den when referring back to a noun that is an en word, like en tidning (a newspaper). If you were throwing away an ett word, like ett kvitto (a receipt), you would say Jag kastar bort det instead.