Learn Swedish: Tack, jag mår bra.

In English, we use the verb 'to be' to say 'I am well.' But in Swedish, you use the verb mår to talk about your health or how you are feeling mentally and physically. If you say jag är bra, it actually means 'I am a good person' or 'I am good at a specific skill'!

Does Tack mean 'Thanks' or 'Thank you'?

It means both! Swedish uses Tack as the standard word for gratitude in almost all situations, so you do not need to worry about choosing between a casual 'thanks' and a more formal 'thank you'.

Does bra mean 'good' or 'well'?

It can mean both. While English has different words depending on the grammar (like a 'good' day vs. doing 'well'), Swedish simply uses bra for both.