Up to now, your programs have run top to bottom, one line after another. Control flow is what lets a program make decisions and repeat work, which is where it starts to feel like real software.
The module begins with conditional statements: if, else if, and else, then the switch statement for choosing between many cases. It moves on to loops, covering while, do-while, and for, and finishes by putting loops and conditions together in a small guessing game.
Watch the lessons in order, then continue on to Functions & Scope.
C Programming Tutorial 4: how to make a program choose between paths using if, else if, and else.
Programiz's lesson on the switch statement and break, including switch with multiple cases and a simple calculator example.
C Programming Tutorial 5: using a while loop to run code repeatedly until a condition changes.
A walkthrough of the three loop types in C, with examples of each, so you can pick the right one for the job.
The freeCodeCamp chapter that combines loops and conditionals into a number guessing game. Starts at the 2:37:48 mark.