Sweden has a tendency to celebrate team building, which sometimes is good, sometimes is bad. The good side is that generally sports teams are 'better than the parts' because they work well together. In daily life, people are rarely left behind. If you need a lot of extra assistance from your teachers to pass your class, you're entitled to it. (Does not always work in practice, but if you're behind you do get a lot of extra help.)
The bad side is that when we get super starts, who are happy to tell you they're super stars, they're considered arrogant and will be castigated for it. Similarily in school, don't point out if you're great at something neutral
The word 'lagom' means 'not too much, not too little', or 'not too far, not too short'. Just a good, reasonable amount/length/etc. So if someone is pouring you a drink you can say you just want 'lagom' so they don't fill it to the top, but aren't cheap either.
'Fika' is kinda the 'eat a cake/cookie/something' equivalent to eating a meal. If you go for a fika you're likely to have coffee or tea (or, less common, juice, milk or something) and some kind of bakery product, or less frequent, candy or something.
It's not that rare to eat like that in other countries I'm guessing, but it's pretty frequent here, like you'll do it several days a week. Idk, foreigners have commented the practice.