What should I study now?

Hello. I'm new in this forum. I'm spanish so my English is not very good. My name is William and I'm 17 years old. I have been studying computer science since 2-3 years ago. I have learnt web programming (PHP, MySQL, JS, Wordpress, HTML, CSS, Jquery...) and now I'm trying to learn other things. I have done some video courses about computer networking (things like TCP/IP and OSI models, types of IPs, VPN and all that stuff). After that I have done courses about C. Now I'm finishing a book called C Notes for Professionals (a open source book). I think that knowing C I can go up in the hierarchy learning things like C++ and using C inside for creating applications for users. I can also go deeper and start learning Assembly lenguage, the structure of the CPU...

May you help me decide? If I wanted to learn how C is read by the computer and learn more deep about PCs, should I read first about Assembly lenguage, the structure of computers or about the operating systems? What order and which route should I go?

I mean: finishing my C book, and if I wanted to go deeper, should I learn what first: Assembly? Operating Systems? Computer architecture? What route should I follow?

Thanks for the help and sorry for my English :)

What does "go deeper" mean? What exactly do you want to do? That will determine your next language.

I mean like: C is more deeper than Python. Assembly lenguage is more deeper than C. Binary is more deeper than Assembly. The structure of the CPU is more deeper than binary lenguage...

Operating Systems is a good next choice. You do not need Assembly to learn Operating Systems.

I would say Assembly is above Computer architecture; but, not by much. And, some might say the other way around.

NOTE: You really can not learn Assembly! Because their are many different Assembly for each of the CPU families.
And some of the CPU families have more than one version/dialect of Assembly.

Tim S.