Sorry for the late reply! I was unwell.
Unfortunately this course is now quite out of date,. It is still on Apache 2.2 and there have been svereal big realeases of other software since the course was written. And obviously it should go on further, to deal with other topics..
We also need a version in the Turkish language.
I don't have a lot of time right now to do this. Making online information takes a lot of work. You need to retest everyting before you post it!
I have set up a git repository to update the course and also for volunteers to add a Turkish translation.
https://github.com/chrisstephenson/droplet-setup
I have had some interest, but very few pull requests! If you have progressed with your installation, you could contribute, too. If you don't know how to do that just mail me again.
Best wshes
CS