The study followed people who used computer screens for learning versus paper reading to learn, and found that while screen learning helped solidify the details of the learning, paper reading helped readers better understand abstract concepts.
Better put, concrete memory from reading involves the who and when, whereas abstract concepts tend to lean towards where and why.
The results showed that abstract thinking was impacted by computer screens but concrete memory was not.
The basic gist that we can take from it is that when learning something, it may be in your best interests to digest the information from multiple media forms. For example, if you want to recall the dates of certain events, a computer screen may help you better remember them when studying. However, if you want to recall why such an event occurred or where, paper may be your best bet.
The next time you go to study something, consider this twofold approach. Perhaps read up on the topics online and then print out the cliff notes. Next, study those as well. See if this helps you store all of the abstract and concrete information better.