How can I become a certified Fusion 360 user?
Start with registering at their website and go from there.  There is a PDF of a list of things you have to have mastery in:


  
  SKETCHING
  
  
  Sketch Creation
  Create Dimensions
  Constraint selection and creation
  Edit a sketch
  Project Edges
  Edit a Sketch
  
  DRAWING
  
  
  Creating a Drawing View, Base, Projected, Section, Detail
  Add Annotations
  Editing a Created View
  Edit Border and Titleblock
  
  SCULPT
  
  
  Create a Form
  Edit a Form
  Thicken a Form
  
  DIRECT MODELING
  
  
  Feature Deletion
  Press &amp; Pull Tool
  
  ASSEMBLY MODELING
  
  
  Create and Manage Top Level Assembly and Subassemblies
  Create a Component From a Body
  Align and Assembly Joints
  Interference
  Rigid Groups
  Motion Studies
  
  ADVANCED MODELING
  
  
  Sweep and Loft
  Boundary Fill
  Split and Combine bodies
  
  PART MODELING
  
  
  Create extrude features
  Apply Fillets and Chamfers
  Create complex hole features
  Create revolve features
  Create a pattern of features
  Create a shell feature
  Create Construction Planes and Axes
  Inspect command; measure, and section analysis