Open Source PC

Does anyone know where I can learn CSS? I’m trying to build my own website and I know a little bit about CSS but I need to know more.

I want to alter a premade wordpress theme and without knowing any CSS its hard to alter it.

If there is a website where I could learn this stuff, that would be great since my budget is close to nil.

Thanks for the help in advance!

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I would like to to edit open source codes and building as applications. I’m wishing to edit entire operating system of linux in future. But unfortunately I know only a little bit of C++, and I don’t know how to building applications from source codes. So i wish to move step by step from a simple software. Where can I download open simple source codes? and How can i compiling it as applications?

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