General Information:
EU-Community: https://www.daad.de/de/laenderinformationen/
EURES-Portal: https://eures.ec.europa.eu/index_de
Visa:
Visa types and requirements: https://www.schengenvisainfo.com/estonia-visa/
Entry and residence requirements:
Estonian Ministry of Foreign Affairs: https://www.vm.ee/?q=en/node/4039
Social insurance provisions:
Ministry of Social Affairs: https://www.sm.ee/
Tax regulations:
Ministry of Finance: https://www.fin.ee/?id=621
European Commission: http://ec.europa.eu/youreurope/business/managing-business/paying-taxes/estonia/index_en.htm
Accommodation:
Homes and Property: http://www.myhome.ee/
Country information:
Wikipedia: https://en.wikipedia.org/wiki/Estonia
Culture Crossing: https://guide.culturecrossing.net/basics_business_student.php?id=65
Further information:
Tourist information: https://www.visitestonia.com/en
Lonely Planet: https://www.lonelyplanet.com/estonia