The Clack County Composter Recycler program is offering free, online and in-person instruction about “SMART” composting from 10 to 11:30 a.m. April 20 at the 78th Street Heritage Farm, 1919 N.E. 78th St. in the Hazel Dell area of Vancouver. Register at clarkcountycomposts.org/classes-and-workshops/current-offerings/860-composting-field-training-instruction-3.