Here are some general resources that help to diagnose 3d printing issues with prints and to get up to speed if you are just starting out 3d printing!
For troubleshooting prints (They use an Ultimaker 2 but userful for other manufacturers issues)
This article is also a good general overview of FDM printing:
http://3dprintingforbeginners.com/3d-printing-technology/
In regards to learning about different materials:
http://3dprintingforbeginners.com/filamentprimer/