I'm not sure how old you are but I remember using the internet back when they had BBS's.  I really enjoy what it has evolved into.  How about you?
I do not start to use the internet early but the fact that some interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide can send and receive information is a breakthrough. 
I agree - quite a break through for humans.  They finally had a spot to exchange information instantaneously.  It's interesting to think about days before it was widespread.  What did people do with their free time?
I love the working principle of  computer network. The use of  nodes to share resources.
Sharing resources is something that can be translated in many different forms.  This can include assembly lines all the way down to transistors.  It's crazy how different forms can inspire other forms. 
Hmmm. Do you know about transistors and semiconductor . I know so much about electronic signals and electrical power.
I don't know a lot but I do have a lot of respect for Nikola Tesla.  His knowledge has led us to many great inventions.
Nikola Tesla
Nikola Tesla (; ; ; 10 July 1856 – 7 January 1943) was a Serbian-American inventor, electrical engineer, mechanical engineer, and futurist who is best known for his contributions to the design of the modern alternating current (AC) electricity supply system.
Born and raised in the Austrian Empire, Tesla received an advanced education in engineering and physics in the 1870s and gained practical experience in the early 1880s working in telephony and at Continental Edison in the new electric power industry. He emigrated in
of interconnected computer networks that use the standard Internet protocol suite (often called TCP/IP, although not all applications use TCP) to serve billions of users worldwide.
- World wide web – part of the Internet; system of interlinked hypertext documents accessed via the Internet.
- Wireless computing – any type of computer network that is not connected by cables of any kind.
- Mobile computing – form of human–computer interaction by which a computer is expected to be transported during normal usage.
- Computer