You have decided to get a PhD. OK but I cannot let you do it without giving you a few life saving instructions in order to survive. Most human beings do not know what it means to get a PhD. You have to say goodbye to about 18 years of protection by the syllabus mommy. You leave the warm home, where teachers and professors tell you what to learn and what to do.
Welcome to the wild side. Its like becoming a member of a tribe with crazy rites, a chief (professor), subordinates (post docs), sub-subordinates (PhD students), sub-sub-subordinates (students) and handicrafts (structured paper stacking, reading multi color layered white board paintings, dealing with different types of deadlines, …). Because life in the wild is tough here a list of websites you should use during your PhD to adapt to the new circumstances.
XKCD (Randall Munroe)
If you need something else to think about with relation to maths, technology, childish or grown-up curiosity you will enjoy XKCD.
(If you are not able to enjoy it: http://www.explainxkcd.com)
I wish you well and hope to see you in some of the dance your PhD videos.