Some may find this course helpful. It is free. I posted it before but for some reason it disappeared. I took this course several years ago and it was very good for the newcomer to Linux.
https://www.edx.org/course/introduction-...-lfs101x-0
For the more advanced Linux user there is this.
https://www.edx.org/school/linuxfoundationx
https://www.edx.org/course/introduction-...-lfs101x-0
For the more advanced Linux user there is this.
https://www.edx.org/school/linuxfoundationx