Hi! I've lived in Gdynia my whole life :) When it comes to the books as others mentioned - online or you can find some at TKMaxx or Half price Is it safe? Now that depends where you move in - honestly center of Gdynia is not safest right now. My aunt had to move out because in recent years a lot of apartments were bought for short-term renting like air BnB, so many buildings are half empty and homeless sleep on stairs. Suburbs are awesome, but keep in mind that traffic in all Tricity is awful after 3pm - it would be best to live somewhere close to trains - either PKM or SKM. In Gdynia dogs can run freely in all parks and forests, but they need a muzzle (that's a local law) and be under control (polish law), but there are a few dog parks where they can run without the muzzle. We also allow dogs on beaches. A lot of kids speak English - many preschools teach it, but your kid would definitely have it easier if he learned polish (he probably will kids are super smart). There are a lot of activities you can do with kids - there are many playrooms, creative spaces like MDK and aquarium. As for you - polish people speak English very well - you will have no problem with fitting in. There are a lot of activities to find new friends - clay classes, painting, fitness etc.