What technologies do I want to learn?

Occasionally, I searched the internet and thought I was really inferior to anyone when I saw some very popular technologies. I always hoped that I could be as knowledgeable as these cool people, however, I don't know where to start or where to start. In fact, I feel that I am still working very hard. I will learn some technologies or research something as soon as I have time. In particular, a technology like web development involves too many aspects, such: CSS, web layout, compatibility of various browsers, some cabinets of JavaScript and JavaScript (such as jquery and prototype), Ajax and ASP. net, component encapsulation, and some open-source boxes such as nhib.pdf and Castle. As soon as I saw so many advanced technologies, I felt that I was too small to be familiar with or use them one by one. How should I start ???