1. Array - bit.ly/3vM1JP5
2. String - bit.ly/3SMkjkb
3. Binary tree - bit.ly/3JIsn1i
4. Linked List - bit.ly/3zFatrn
5. Dynamic Programming - bit.ly/3vLwjs5
6. Recursion - bit.ly/3JDhUnv
7. Miscellaneous - bit.ly/3vLbAVm
8. System Design - https://www.java67.com/2018/05/top-20-system-design-interview-questions-answers-programming.html?m=1
