This self-paced WHO training on Mental Health and Psychosocial Support (MHPSS) in emergencies has thirteen modules on various topics. The course lasts seven hours, with a certificate issued on successful completion. WHO provides several documents and training materials on Psychological First Aid.
Understanding Mental Health in comprehensive perspective. 
PFA is a step-by-step training guide to provide PFA by a field worker.
Document for facilitators to help the field workers on PFA. 
 

EQUIP is a joint WHO/UNICEF project to improve the competence of helpers and the consistency and quality of training and service delivery. The EQUIP platform makes competency assessment tools and e-learning courses freely available to support governments, training institutions, and non-governmental organizations in humanitarian and development settings in training and supervising the workforce to deliver adequate psychological support to adults and children.