Corse for ethical hacker

Answer 1

Questions about hacking are not allowed here, and hacking related courses are not available. Although there is a community lesson called "Cryptography", you may learn few things from it.
https://www.sololearn.com/learn/10363/?ref=app

You might also find some useful resources in this thread.
https://www.sololearn.com/Discuss/563537/?ref=app

Answer 2

Not here, try youtube.