Oh this is so so hard to answer as tech is literally my biggest obsession next to pop culture. I will give a list. I'll try to keep it small.
Hardware Home Computers this includes PCs and Macs, smartphones, most cameras, TV & Home Theater tech, and so much more.
Software Standards: PHP, MySQL, all markup languages, Javascript, to much else to name. I don't like this question yet I love it.
Misc: Security standards like Two Factor Auth, UBI Keys, and Encryption standards.
Ok I basically love everything, and love learning about tech and science.