Here are a few resources to learn more.
The UK in a changing Europe http://ukandeu.ac.uk/
Fact Check EU http://factcheckeu.org/
‘What country friends, is this?’ A guide to the EU Referendum debate from Bath University
The EU scorecard produced annually by British Influence which shows progress made or otherwise on different issues in the EU by the British.
Gordon Brown Britain: Leading not Leaving
The UK government is advocating a Stay vote. here is their leaflet.
InFacts Myth-busting website reacting to errors as they are made
Blimey It could be Brexit! A Creative Commons book being written as the campaign progresses
From the UK Government
From the EU
The EU has been informing EU citizens about what it does and how for many years. The best option is to visit its Teachers Corner. Here is a selection:
An app called Eurosceptic by Daniel Hannan. The first chapter is called ‘After we leave – making Britain great again’ which does not exactly resonate well with me given what’s going on over the pond.
‘Flexcit: The Market Solution to Leaving the EU’ by Richard A E North 2016 Available free here.
‘The Trouble with Europe‘ by Roger Bootle 2015
Peter North http://peterjnorth.blogspot.dk/
Richard North http://eureferendum.com/
Ben Kelly https://thescepticisle.com/
Balance of Competences
The UK government did an unusual thing in 2011 by commissioning a series of in-depth reports on the main aspects of the UK’s membership of the EU. It is unusual in that few other EU member states have done the same. These were prepared during 2012-2014 and are available in their entirety here. The reports cover all the main issues such as agriculture, fisheries, migration, the Single Market, Human Rights and many more. The main purpose of the reports was to evaluate whether the balance of powers between the EU and the UK were appropriate. The final conclusion is of course mixed but on balance that the distribution of powers is about right with a need for change at the margins.
Warning! Long (but that is what such a complicated issue as the EU merits to do a thorough job).