EU secondary legislation is made by the EU institutions and include unilateral secondary law and conventions and agreements.
Unilateral acts can be divided into two categories:
Convention and Agreements group together:
Secondary legislation is published in the Official Journal of the European Union. You will find the Official Journal in the European Documentation Centre from 1992 - 1997.
EUR-Lex contains electronic copies of all Official Journals since the first edition. Effective 1 July 2013, the electronic edition of the OJ (e-OJ) is authentic and produces legal effects.
EU legislation is freely available on EUR-Lex. Search or navigate through the EU legal collections
amendments/corrigenda to it.
When you have found legislation a lot of extra information is available, e.g. National Implementing Measures (National transposition) communicated by the Member States concerning.