On the Publications page of the European Court of Human Rights (ECHR) website you will find quite a few handbooks and other publications which can help you with your research.
For instance, the Handbook on European data protection law is a joint publication of the ECHR and the European Agency for Fundamental Rights (FRA). This comprehensive guide deals with the protection of personal data, by explaining the EU’s and the Council of Europe’s applicable legal frameworks and key jurisprudence of the European Court of Human Rights and the Court of Justice of the European Union.
On the same webpage you’ll find the publications of the Council of Europe’s Directorate General of Human Rights and Rule of Law, with a link to all Human Rights Handbooks. In each handbook one aspect of the European Convention on Human Rights or its protocols is explained.