Your application written in C or C++ works as intended, so you are done, right? But did you consider feeding in incorrect values? 16Gbs of data? A null? An apostrophe? Negative numbers? Because that's what the bad guys will do - and the list is far from complete.
Handling security needs a healthy level of paranoia, and this is what this course provides: a strong emotional engagement by lots of hand on labs and stories from real life, all to substantially improve code hygiene. Mistakes, consequences and best practices are our blood, sweat and tears.
All this put in the context of C and C++, and extended by core programming issues, discussing security pitfalls of code written in these languages.
So that you are prepared for the forces of the dark side.
So that nothing unexpected happens.