A classic book. It guides you through novice stage to mastering the language . It introduces all the important aspects of the C programming language. All the code and concepts in the book are perfectly portable.
There is absolutely no compiler-specific code here . This might be a pro or con depending on your intentions. You cant dive into writing your own fancy programs after reading the book , you might have to go through your compiler documentation to use some very useful but non-portable libraries such as conio or unistd.
But on the other hand if you stick to what is given in the book , all your code would be perfectly portable which is more often than not a very welcome thing to do.