If you are new to Blueprint Visual Scripting in Unreal Engine 4, these Blueprint How Tos provide information on the core aspects needed to work with Blueprints including Creating Blueprints, Adding and Connecting Nodes, Creating Variables and others as seen in the tables below.
When you are ready and have an understanding of the core aspects behind Blueprints, Gameplay oriented Blueprint How Tos can be found in the Making Interactive Experiences which illustrate gameplay related elements like Spawning/Destroying Actors, Respawning (OnDestroyed), Using Timers, and more.