This e-learning module offers you basic knowledge on composting and mushroom growing. It is intended for (new) employees active in composting or mushroom production. Mushroom Signals Essentials is also very instructive for people employed in the supplying industry. It gives a very overview of the different stages in the composting and growing process. Mushroom Signals Essentials is based on the basic knowledge described in the Mushroom Signals book. The module contains practical questions and is completed by a test and certificate. It takes about 6 to 10 hours to complete the course.