Some links for starting with Linux.
* [Linux Journey](https://linuxjourney.com/)
* [Games to learn. Start with Bandit](https://overthewire.org/wargames/)
* [Bash for beginners](https://www.tldp.org/LDP/Bash-Beginners-Guide/html/)
* [Linux is not Windows](https://linux.oneandoneis2.org/LNW.htm)
* [man hier](http://man7.org/linux/man-pages/man7/hier.7.html)
The last one made a lot clear for my about understanding why Linux does things in a certain way when compared to Windows.