At this moment there are 477M Gulden in existence of which 415M are circulating. 
Of those 477M 190M was created in 2014 and the other 248M are since then found by miners as blockreward, that's where the NLG do come from, miners. Oh, and witnesses nowadays.

I could explain how some of those Gulden that Nocks sells come on Nocks but it would feel awkward to do so.  Nocks is an exchange.

Nocks is not a store that hangs a pricetag on a product at a price they see fit.
It's an exchange where the price is determined by supply and demand. 
See https://www.nocks.com/trade/NLG-EUR

Now as an extra service you can buy Gulden at Nocks using iDeal or Bancontact but that's a frontend where you actually do a marketbuy on the exchange.

If you own a Raspberry and have GuldenD running on it there are some settings that could influence how well it works.
If you are totaly unfamiliar with navigating a linux systme from the commandline and your RPI is working fine you do not have to do anything, if it ain't broken don't fix it.
For these changes you need access to the commandline, either via VNC, SSH or by connecting a keyboard and monitor (TV with HDMI will work fine) to it.  Then edit the file Gulden.conf using the command:
`nano /opt/gulden/datadir/Gulden.conf`

1) When Phase-3 went live there were problems with high CPU and memory usage.  We found some workarounds by then that alleviated the problem but are not necessary anymore since version 2.0.0.9 (Or even counterproductive now):
----------
maxmempool=20       <-- remove
dbcache=20                <-- remove
maxsigcachesize=4    <-- remove
rpcthreads=1              <-- remove
par=2                           <-- remove
minimallogging=1       <-- remove, this is now the default on RPIs

2) 'tweaks' that _are_ usefull on RPIs.  (If you made changes to these before please check the values given below)
---------
maxreceivebuffer=1024   <---- default = 5000 which is a bit high imo (5MB).
maxsendbuffer=256         <---- 512 is also fine.
maxconnections=60         <---- Around 50 or 60 is fine.  Do not go higher than 75 on an RPI unless you know what you are doing.

These settings also apply on more beefy nodes running on a VPS although there you can go way higher on maxconnections= but that depends on how powerfull your (virtual) CPUs actually are.

3) Add the adress of one or two (more than two is not necessary) known stable and up to date nodes.  By doing this your node connects to this one first which means it will probably elect it as the 'preferred download'.
----------
addnode=83.161.66.135
addnode=185.167.206.35

All of these also apply for beefier nodes running on VPSes and whatnot with the exeption of 'maxconnections='.  More powerfull machines can go with a much higher number there depending on the exact power of your (virtual) CPUs.  400 or more is cool if it's faster than an Intel Atom and has 2GB RAM (ymmv).

In general the article is fine. 
One flaw is that the article classifies Yobit as suited for something which would be a bit far stretched.

I had Mammon in Support-Chat through the website yesterday and we walked through the steps to solve his problem.
He hasn't returned so for now I asume the problem is solved.

Version 2.0.0.11 of the desktopwallet has just been released.

This is a recommended update for everybody, especially if you have witnessaccounts.

You can download it from the usual places:
Gulden.com/download or github.com/Gulden/gulden-official/releases/tag/v2.0.0.11

Gulden ontwikkelt zijn eigen wallets.

De nieuwste versie van de wallets kun je vinden op Gulden.com/download
Of voor de desktopwallets gewoon rechtstreeks via Github: github.com/Gulden/gulden-official/releases/
De mobiele wallets voor Android telefoons/tablets en iPhones/iPad zijn te vinden in hun respectievelijke appstores.
De Guldendocker repository is te vinden op https://github.com/paulwillen/GuldenDocker

Hardwarewallets zijn niet compatible met Gulden.

Actually: NO

On July 12th 2018 - 16::00 UTC upgraded miners will be able to begin signalling their upgrade status in the blocks they mine. Every 2016 blocks (roughly 3.5 days) the quantity of upgraded blocks is measured and once a sufficient percentage signal upgrade Phase 2 will become "locked in"; after this another 2016 blocks window period is allowed before Phase 2 becomes fully activated.

When Phase 2 activates the witnesses can start filling their witnessing acounts and when the threshhold for the amount is reached Phase 3 will activate, and THAT is the moment PoW-reward will change from 100 to 80.

See: https://github.com/Gulden/gulden-official/blob/master/technical_documentation/PoW2_activation.md

No, this wouldn't have.
After the release of PoW2 and Segsig the wallet still needs to be able to read the blockchain as it is now, so all the backwards compatible code is there anyway. 
This IOS-release will basically have many of the good things (like UI-improvements and codebasecleanups and bugfixes) that 2.0 will also have but without the 2.0 specific features present/activated.   A somewhat clean codebase is modular so this is relatively easy to do.  Also one might regard it as a partial sneakpreview.

So RichPissman came up with proof that a company named Gulden.com B.V. does exist.  That wasn't a secret.

If one looks close at the proof (From the dutch CoC) one can see that it was founded in nov aug 2017.  So the first 3 years there was no company simply because it wasn't needed during all that time.  
The company was registered because of a particular issue that needed solving for which a company was required instead of only a natural person.

Bonuspoints: one of the two works at the company which is the main sponsor for the very TV-program.  
Then again, it was a quick question about personal opinion about a quick list of coins mentioned which makes good TV for the n00bs with a tie.

The minimum amount of Gulden to be able to witness is:
-   5000 Gulden for a period of at least 331 days.
- 10000 Gulden for a period of at least 1 month (30/31 days?)

What works is this trick::
1.) Go to Menu > Help > Debugscreen
2.) Choose the tab 'Console'
3.) Type this: `addnode 83.161.66.135 add` and press  

Looks like this:
https://gyazo.com/1ea1490a702be175e039b94d90d6126e

It might take 1 or 2 minutes but after that you should see at least one peer and the tab networktrafic should show some activity.

Mwoh, I just payed my real lunch in a real lunchroom out here in the real world. 
Use case?  Check.

Had you paid more attention you might have noticed the sourcecode is and will be available for viewing, reviewing, compiling and what not. 
Just not free to use/steal/implement by other coins.

Those values in $ are correct.  
At that moment in time there was that difference between Bittrex and Nocks, which is fine.  It has been the other way around too.

A good place to start would be dev.Gulden.com

This CMC is -a- way to benchmark one coin against others. Each may decide for himself how valuable this tool is and how comparable one coin is to others.
Just for fun go to CMC, click on [Coins] and select Filter_Non-Minable, Gulden ranks differently there, for what it's worth.

It's meant as a cold storage.
You load Gulden on a wallet, write the recovery phrase on the note, doublecheck, cover with tamperproof sticker and you have cold storage, delete wallet from device. 
Can be seen as a collectors item too since they do look very cool.