In order to learn we have to gather and organise information, in a logical and meaningful way, then make sure it sticks i our brains. or at least know where to find the information in our knowledge management system when we need it. One core part of that process for Greg is to create mind maps and cheat sheets. These are great references, but more importantly, the process of gathering and organising the information is a great way to internalise the knowledge. Take a look at these examples and let me know if they are useful to you in the comments. Even more importantly, create versions of your own and suggest other subjects that would be useful to have summarised.
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