Complete User Guide of WhatsApp (updated 2016) which contains a series of free mini-guides and tutorials on all the features of WhatsApp, official and unofficial. The instant messaging application is here analyzed in detail and in all its secrets, from simple tasks to send messages and photos to the lesser known tricks!
To facilitate navigation between the various topics, here is a simple index divided by broad categories.
WhatsApp: First Steps
WhatsApp: Ticks (or Marks) and Emoticon