Here is the list of some free courses for pentest and security/linux.

Basic linux https://tryhackme.com/room/zthlinux

Basic Kali https://tryhackme.com/room/ccpentesting

Basic pentest

https://tryhackme.com/room/easyctf

https://tryhackme.com/room/picklerick

https://tryhackme.com/room/basicpentestingjt

https://tryhackme.com/room/wgelctf

Have fun ^-^