Presentation of online lessons in the Czech language for B1-C1 level in the Moodle environment (structure of lessons, types of exercises and activities, opinions and experience of students and teachers) within the seminar of Professor Čermák, organized at ÚBS FF UK for the academic community and lecturers of Czech for foreigners. Lessons have been developed within the framework of international cooperation and the EU-funded WRILAB2 project.