Specific Learning Disabilities or Difficulties (SLD) is a broad term that includes dyslexia (reading/spelling), dysgraphia (handwriting), dyscalculia (mathematics) and dyspraxia (fine and gross motor skills). Read more here
Other types of SLD are to do more with the attention and focus that students may be able to maintain such as Attention Deficit Disorder (ADD) and Attention Deficit Hyper-Activity Disorder (ADHD). There is a more comprehensive list and descriptions here.