c language beginners : c programming for beginners - master the c language : https://www.udemy.com/course/c-programming-for-beginners-/
c language beginners : c programming for beginners programming in c - theory , practicals and hand on : https://www.udemy.com/course/c-programming-for-beginners-programming-in-c/
c language advanced : advanced c programming course : https://www.udemy.com/course/advanced-c-programming-course/
data structures : mastering data structures and algorithms using c and c++ : https://www.udemy.com/course/datastructurescncpp/