Very short book – argues that getting a smaller house is better as less time and energy is spent maintaining it. Then rather frugal concepts explained about not spending much money.
Second part about Hygge a concept from Denmark culture. This relates to companionship, time spent with close friends and family enjoying drinks (like hot chocolates) with close intimate chat. This word is based on hug from English. Implies that making time to apply this concept into your daily life will add to your happiness.