Learn how to read from and write to files, enabling your program to persist data.
Learn how to open a connection to a file using `fopen()` and close it properly with `fclose()`.
Learn to read and write blocks of binary data, ideal for handling structures or arrays.
Learn to read from and write to text files using formatted input and output functions.
Understand the different modes for opening files (`r`, `w`, `a`, `r+`, `w+`, `a+`) and their binary counterparts.
Learn how to check for and handle errors that can occur during file operations.