This lecture introduces the course 'Neuroscience: Cellular' and its structure, including a Massive Open Online Course (MOOC) and a mini-project focusing on neuronal function. Topics covered include cell membrane, ion channels, membrane potential, cable properties, synaptic transmission, glutamatergic excitation, GABAergic inhibition, brain function, and behavior. The course aims to link biophysical mechanisms with behaviors studied in mice, emphasizing the brain's information processing through neuron activity.