This lesson covers the process of creating a boundary value problem domain and discretizing it for solving. It explains how to start the mesher, view the geometry, and reset the view if needed. The lesson further delves into generating an initial mesh, improving its uniformity, and reducing the discretization error by creating a finer mesh. It also provides instructions on how to edit the element sizing, change the curvature capture, and update the mesh. Finally, it emphasizes the importance of saving the project.