What cultural faux pas should I try to avoid making in Finland?

"It is important to be aware of cultural differences when visiting Finland. It is considered impolite to be late for appointments, so it is important to arrive on time. It is also important to dress appropriately for the occasion, as Finns tend to dress more formally than many other countries. It is also important to be aware of the Finnish custom of personal space, and to respect the personal space of others. Additionally, it is important to be aware of the Finnish custom of not discussing personal matters in public, and to respect this custom. Finally, it is important to be aware of the Finnish custom of not discussing religion or politics in public, and to respect this custom," remarked another expat in Finland.