European Union law
This is the entrance to the main EU site, which has a huge amount of material on all aspects of the EU. The "EU law" section contains good summaries of the law making process within the European Union, as well as access to legislation and case law, via EUR-Lex (see below).
European Court of Justice
Lots of information about the workings of the court, and access to the case law in English and French. The monthly Case-law Digest, being a summary of important recent decisions of both the Court of Justice and the General Court, is a good place to start.
“The Summaries of EU legislation inform on the main aspects of the European legislation, policies and activities in a clear, easy-to-read and concise way. These Summaries are intended for a general, non-specialized audience and cover 32 topics corresponding to the activities of the European Union.”
Direct, searchable access to the Official Journal of the European Union.
UK Government Brexit Page
Contains official guidance from the UK Government on the new arrangements with the EU, including importing and exporting goods (and services), providing services, travel to the EU, and the particular rules applying in relation to Northern Ireland.
Scottish Government Brexit Page
Information on the UK's exit from the European Union, and how it may affect people and businesses in Scotland.