I am not interested in investing in cryptocurrency. I want to understand crypto inside and out, every aspect. In order for me to do that I am going to need to start off with a piece of reliable material (a good book, or a good course - not a college course, but an online course) which will teach the most important aspects of crypto and explain/give definitions to the technical terms such as "blockchain" etc. Once ive done that I will look for a more extensive work and study it. After that I will work on studying every part of crypto individually to arrive at the essence of what it is essentially. So I am basically asking for a good primer which will be a good foundation that I can build upon. Thanks.