Yes, it's available on Amazon, Book Depository etc.
pgfplots can use gnuplot as backend with pgf and TiKZ as frontend.
There's a gallery that gives a nice overview with examples and compilable code: https://pgfplots.net
It is about the site itself. But I agree with you and added a short information about TikZ with a link to TikZ on GitHub.
Yes, it's available on Amazon, Book Depository etc.
pgfplots can use gnuplot as backend with pgf and TiKZ as frontend.
There's a gallery that gives a nice overview with examples and compilable code: https://pgfplots.net
It is about the site itself. But I agree with you and added a short information about TikZ with a link to TikZ on GitHub.