• Get a good night's sleep or take a power nap after learning something new, to help retain and retrieve memories better. Sleep deprivation and acquisition of too much information will not help you save those memories.
• Get moving, to improve the flow of oxygen-rich blood in your brain and to trigger neuron growth and new connections in the brain - critical for memory.
• Improve your diet. Fats from food can build up the brain, resulting to poor blood flow.

Any system or device designed to aid memory:

• patterns of letters or words (common mnemonics)
• ideas (memory palace)
• associations (chunking)

Taking a structured approach to note-taking is the best way. Put the outline notes by choosing four or five key points of the lecture, followed by in-depth sub-points. One way to review is to use the Cornell Method, which divides the note sheet into three sections:

• Cues: It includes key questions and main points.
• Notes: Which you write during the class using the outline method. 
• Summary: Which you can write after class while reviewing.

The mind map is a visual diagram of abstract concepts.

It works best in subjects like chemistry, history and philosophy, subjects having a neural network like interlocked and complex topics. 

Learning how to learn is critical for everyone. Most of us have to deal with a changing world and to learn how to manage tons of new information.

However, most of our learning methods are outdated and far from optimal. It may even be giving us an illusion of learning, like re-reading and highlighting that don't provide proper feedback to show what you haven't learned.

Focused and diffuse modes provide two models for how we develop, elaborate, deepen and broaden connections. Both methods are important.

• The focused mode of learning is about bringing related concepts together into a unit, called a chunk. 
• The diffuse mode operates through a wider net of connecting general ideas across different fields. We use this diffuse mode while we sleep, exercise or daydream.