Linux os and Windows

Question

assalamualikum ( Hello )

1. What is difference between Windows CMD and Linux Terminal

2. which language is used in a terminal and Cmd

3. I wanted to become a Linux expert which language should I learn

4. which language should I Leran if I wanted to create my own Linux distro and linux apps

Thanks for reading and Answering
Take Care and always Smile :)

Answer 1

Thank you for Help :)