linux – Need some advices in beginning in white-hat

I’ve just started learning white-hat hacking and need some advices.
Firstly, where I can get tasks from Linux and bash to practice, because I cannot find them in the Net?
Secondly, where I can get tasks from python to practice, because there aren’t a wide range of sites with this topic?
Also, if it is possible, can you write some advices to me how to learn and practice in white-hat hacking better, because it’s my dream.