Numbers

Introduction to number systems and binary

https://www.youtube.com/watch?v=ku4KOFQ-bB4

Binary Numbers

https://www.youtube.com/watch?v=ry1hpm1GXVI

Hexadecimal number system

https://www.youtube.com/watch?v=4EJay-6Bioo

Number Base Conversion Practice

https://www.youtube.com/watch?v=Fpm-E5v6ddc

Learning ASCII

https://www.youtube.com/watch?v=KYEDJChGxh8

Understanding ASCII and Unicode

https://www.youtube.com/watch?v=5aJKKgSEUnY

Unicode

https://www.youtube.com/watch?v=2r6OZD5n-wc

Data Types (Char, String, Integers, Floats, Boolean)

https://www.youtube.com/watch?v=XTfepENJ140

Source: YouTube