The article represents an innovative model of accumulation and promotion of best practices of  foreign language teaching in the system of lifelong learning. It gives the idea about the nature, status, and features of language teaching practices as a new didactic phenomenon. The author describes the functions and justifies the role of a training platform as a form of exchange of best practices of teaching foreign languages. The research provides the analysis of positive aspects of training platforms as special forms of cooperation between teachers in the sphere of teaching foreign languages with the purpose of sharing best practices. Alongside with that the paper lists the unrealized potential of the platforms, the implementation of which will improve the quality of foreign language teaching within LLL.