gamersonlinux.com has a lot of information on wine in its different install guides. It may be a gaming site, but you can learn a lot from what the tutorials have. How different engines work in different wrappers. If you study it enough you can figure out how wine works in total between the site and fiddling with it yourself.
Not the BEST thing to put here, but people ask me sometimes how I know wine works and thats where I send them.
I like Linux Academy a lot, they have beginner to professional course ware. But you have to pay, but If anyone is interested, they have a black friday promo on their website right now https://linuxacademy.com/
Heya, dont really know if this is fit for this certification / tutorial series,
but I personally greatly enjoyed 0xAX’s series: https://0xax.gitbooks.io/linux-insides/content/index.html
Greetings from a cold Germany 
Stuff like this
RGB Led on a RPI, I used it to visualize at what stage the RPI was in, starting, done loading Linux and most importantly, shutdown of Linux so I know when to pull power.
Instructables are fun and can give ideas to toy around even more.
I have no use of learning how to admin users, couldn’t care less.
Funny but for a starter I think that this forum has some good topics -
and some book recommendations can be found over here -
Well I personally got started with and recommend " Linux: The Complete Reference " and then " Unix and Linux system administration handbook " as they provide a solid foundation to build upon.
Well if books are you’re thing then
Hak5 has some great tutorials for beginners and a lot of others stuff too.
HakTip: Linux Terminal - Getting Started!: http://www.youtube.com/playlist?list=PLW5y1tjAOzI2ZYTlMdGzCV8AJuoqW5lKB
Liveoverflow is great for tinkering and hacking stuff
also the ArchWiki may come in handy
https://wiki.archlinux.org
Oh hey, Hak5, the people that made the Wifi Pineapple PEN test device: https://www.wifipineapple.com/
They also do good server based tutorials on trying to make your own servers.
I used a few pages from beejs, mostly the networking guide.
But honestly, for actual working with linux, and not programming for it, man pages for some tools i use. (i should probably learn sed and awk, but grep gets me by)
For one shot stuff, theres some good things made by the community
https://forum.level1techs.com/search?q=%23tutorial%20%20category%3A27
I’d love to be able to organise those more, so we can build a resource here like they have with digital ocean for example.
The two main resorces i’ve used recently appart from application documentation has been digitalocean for some “howto” examples of deploying stuff as they tend to show up first when your looking for some variations of how people do things, and the redhat documentation which is super handy.
I must admit when ive looked at linux type courses in the past they’ve come across a bit dry and boring, but i think that may be down to them having a tendancy to just say how to do something instead of how to figure out yourself how to do soemthing.
Imo, it would be far better to get people to understand how a tool or system works than do this to make this happen which a lot of people seem to show. Makes any sense?
I found this to be helpful: https://linuxjourney.com
I also found an Android client for the tldr page: https://play.google.com/store/apps/details?id=io.github.hidroh.tldroid&hl=en
There’s the obviously named tutorialLinux on YouTube. The guy really, really, REALLY knows his stuff: https://www.youtube.com/channel/UCvA_wgsX6eFAOXI8Rbg_WiQ
And there’s this Complete Linux Course that I had posted in a topic a couple of months ago: https://www.youtube.com/watch?v=wBp0Rb-ZJak
If you want to learn the base tools like sed, awk, grep and so on, check this out.
http://www.grymoire.com/Unix/index.html
He was one of the devs for Solaris and also help maintain some packages on Gnu, Gnu/Linux, and BSD platforms. He even explains the differences in how some flags work on the different platforms. I use most of these tools daily yet I still refer to the examples on the page for clarification sometimes.
I find myself coming back most often to the RHEL documentation, specifically, the System Administrator Guide whenever I want to do something “the right way”.
Additionally, I regularly use the Arch Wiki and Ubuntu Manpages (though not as much as RHEL).
They are all usually helpful, despite the distro I happen to be working with.
Also, shameless plug, I am working on a project that began in this forum post. It’s still very much WIP, but it’s up here: docsdoc.info (yes, it just redirects to an AWS instance right now). I will add some of the links in this thread when I have chance.
Didn’t realize this thread was kind of dead… my bad.
Just sleeping 
The UNIX and Linux System Administrator Handbook (previously named the UNIX System Administrator Handbook) has always been a great resource, even for novices.